Calf Purchase Research Articles

Sustainable intensification of grass-based beef production systems in alpine regions: How to increase economic efficiency while preserving biodiversity?

CONTEXTBeef production on grasslands has multiple positive impacts. In addition to the production of high-quality protein, marginal lands in particular enable high biodiversity and landscape quality. However, this type of production is perceived as less economical than more intensive meat production systems. OBJECTIVEThe aim of the study is to develop recommendations on how different grass-based production systems can be economically improved without endangering biodiversity. METHODSThirty-five suckler cow farms supplying into two different brand programmes (Natura-Veal: slaughter age at five months; Natura-Beef: slaughter age at 10 months) were grouped into four production systems across two production sites in Switzerland: Natura-Veal, mountain region, extensive (VMount); Natura-Beef, mountain region (BMount); Natura-Veal, hilly region, intensive (VHill) and Natura-Beef, lowlands (BLowla). On the farms, beef production was analysed in detail on the basis of technical production data as well as full cost accounting. The farms were grouped into one model farm (farm type) per production system. On each model farm, optimisation options were simulated and checked for practicability with farmer participation. The optimisation focused primarily on improving cow efficiency via the sale of more slaughter animals per cow, through lower animal losses, higher fertility or the additional purchase of calves suckled by a nurse cow. RESULTS AND CONCLUSIONSDescriptive statistics showed significant positive correlations between stocking rate and land productivity and significant negative correlations between stocking rate/land productivity and the share of biodiversity areas (SBA), confirming previous findings. These relationships were also reflected in the production site of the farms, as mountain farms with lower productivity had a significantly higher SBA, while farms in areas with better grass growth had fewer biodiversity areas but higher productivity. Accordingly, the optimisation options were adapted to the production site under the constraint of a constant stocking rate. In favourable forage-growing areas, further intensification via improving cow efficiency by buying foreign calves led to significant improvements in profitability (VHill and BLowla). In mountain areas, the optimisation potential is lower. Site-adapted, i.e., small-framed and robust, cow types lead to better cow efficiency, which also contributes to good profitability in extensive production with a high biodiversity share, although this is strongly determined by national direct payments (VMount and BMount). Both income and biodiversity can be optimised if cow efficiency is increased and production systems are adapted to the site as closely as possible. SIGNIFICANCEThe study shows practicable recommendations for sustainable intensification in grass-based meat production systems in the current discussion on maintaining or increasing biodiversity in agriculture.

Outbreak of Multidrug-Resistant Salmonella Heidelberg Infections Linked to Dairy Calf Exposure, United States, 2015-2018.

In August 2016, the Wisconsin Department of Health Services notified the U.S. Centers for Disease Control and Prevention of multidrug-resistant (MDR) Salmonella enterica serovar Heidelberg infections in people who reported contact with dairy calves. Federal and state partners investigated this to identify the source and scope of the outbreak and to prevent further illnesses. Cases were defined as human Salmonella Heidelberg infection caused by a strain that had one of seven pulsed-field gel electrophoresis (PFGE) patterns or was related by whole genome sequencing (WGS), with illness onset from January 1, 2015, through July 2, 2018. Patient exposure and calf purchase information was collected and analyzed; calves were traced back from the point of purchase. Isolates obtained from animal and environmental samples collected on-farm were supplied by veterinary diagnostic laboratories and compared with patient isolates using PFGE and WGS. Antimicrobial susceptibility testing by standardized broth microdilution was performed. Sixty-eight patients from 17 states were identified. Forty (63%) of 64 patients noted cattle contact before illness. Thirteen (33%) of 40 patients with exposure to calves reported that calves were sick or had died. Seven individuals purchased calves from a single Wisconsin livestock market. One hundred forty cattle from 14 states were infected with the outbreak strain. WGS indicated that human, cattle, and environmental isolates from the livestock market were genetically closely related. Most isolates (88%) had resistance or reduced susceptibility to antibiotics of ≥5 antibiotic classes. This resistance profile included first-line antibiotic treatments for patients with severe salmonellosis, including ampicillin, ceftriaxone, and ciprofloxacin. In this outbreak, MDR Salmonella Heidelberg likely spread from sick calves to humans, emphasizing the importance of illness surveillance in animal populations to prevent future spillover of this zoonotic disease.

Bioeconomic evaluation of feedings strategies in the yearling beef cattle system in Mozambique

The application of feeding strategies (FS) to meet nutrient requirements of beef cattle grazing on native pastures during the dry season, are required to improve the productivity of production systems in tropical regions. The objective of this study was to evaluate the bioeconomic effects of different FSs applied to yearling bulls in Mozambique, using modeling and simulations as tools to support decision making. A simple deterministic simulation model was developed, assuming initial body weight (120 kg), average daily gain (ADG), feedstuffs, and production costs as inputs. FSs were simulated for a total of 120 days within four ADG systems: 0.000 kg (S000), 0.200 kg (S200), 0.400 kg (S400), and 0.600 kg/d (S600), and three diets were simulated for the positive and maintenance ADG systems, totaling 12 FS. The effects of 12 FS combinations were analyzed and a sensitivity analysis was performed. The effect of the change in the inputs of the model (feedstuffs purchase and calf purchase price) showed the sensitivity of the model to economic parameters (Gross Margin and Net Profit). The negative ADG (-0.200 kg) system (S-200) had the highest labor cost. Corn bran, considering its availability and low cost in the studied region, is a promising feedstuff for concentrates. Effective operational cost (EOC) was higher than 99% in all FSs. S-200, S000, and FS5 within the S200 system resulted in negative net profit (NP) values. Net profit proportionally increased as ADG increased. FS12 (Hyparrhenia rufa, corn bran, and Sesbania sesban) of S600 promoted the highest ratio (NP/total operation cost) (0.48), and consequently, the highest profitability (32.37%). In general, the simulation model shows that, in native and communal pasture beef production systems in regions of Africa with similar production conditions, the productivity of yearling beef cattle during the dry season may be improved by applying feeding strategies.

Transport of veal calves from birth farms to veal farms and calf management in Swiss dairy farms

The calf transports of 34 veal farms were documented over a one-year period in order to describe the transport from dairy to veal farms. Veal farms were visited four to eight times, and general farm management data and information on calf purchase were collected. Thirty-five transports were accompanied and documented in detail by the project team. Whenever possible during the accompanied transports, a questionnaire on calf management prior to purchase (calving location, colostrum feeding, vaccinations, iron and selenium supplementation) was filled in with the manager of the dairy (birth) farm. Unaccompanied transports were recorded using a form completed by the veal farmers and the transporters. Information was collected on the number and origin of the calves, transport duration and distance, and stops on farms and markets. A total of 721 transports from dairy to veal farms (531 transports by veal farmers and 190 by suppliers/livestock traders) were documented in the course of the project. Six veal farmers always collected and transported their own calves, nine received their calves from cattle traders only, and 19 used both systems. Veal farmers transported a median of 2.0 (1-21 calves) and traders 3.0 calves (1-74 calves) per transport. The median number of dairy farms per 10 transported calves was 10.0 (1.2-10 dairy farms per 10 transported calves) for transports performed by veal farmers, and 10.0 (2.5-10 dairy farms per 10 transported calves) by traders. The median transport duration was 20.0 minutes (1-330 minutes) with veal farmers and 45.0 minutes (2-414 minutes) with traders. The median available surface per calf during transport was 2 m2 (0.4-6 m2) in transports by veal farmers and 0.6 m2 (0.4-2.7 m2) in those by traders. No bedding was provided on three transports performed by veal farmers although this is prescribed by law. Intranasal vaccination against respiratory disease was performed in 7% of the 88 birth farms included in the study.

Effects of management practices, animal transport and barn climate on animal health and antimicrobial use in Swiss veal calf operations

To assess the effects of transport, management factors and barn climate on calf health, 43 Swiss veal farms (11 large farms fattening ≥100 calves and 32 small farms fattening >20 but <100 calves per year) were monitored in a prospective cohort study over a period of one year. Detailed questionnaires on farm structure, management, housing system and animal health were filled out with the farmers during bimonthly visits, and barn temperature, humidity, ammonia and CO2 concentrations were measured. Temperature and humidity were also measured continuously over 72 h once each in winter and summer. In addition, calf purchase and transport from birth farm to fattening unit were documented by the farmers, and the study team accompanied one transport per farm whenever possible. Antimicrobial treatment incidence was calculated from the used daily dose (TIUDD). Risk factors for mortality, average daily weight gain (ADG) and antimicrobial use, as well as factors related to transport and barn climate measures were evaluated with mixed regression models.The overall mortality rate was 5.1% (6.2% in large herds and 3.1% in small ones). Identified risk factors for mortality >3% included a lower number of calves fattened per year and a good hygiene of the feeder. This surprising result was likely due to the fact that the threshold of 3% mortality was rather exceeded in smaller farms. Furthemore, higher temperature variation (range between maximal and minimal temperature over 3 measurement days) in the calf pen was associated with mortality >3% in the univariable analysis.The overall mean ADG was 1.40 ± 0.16 kg. Calf purchase was significantly associated with decreased ADG.The median overall TIUDD was eight daily doses per calf and year (2.1 in small farms and 26 in large farms, respectively); the main indication for treatment was respiratory disease (81.1%). Risk factors for increased TI were no quarantine upon arrival, access to an outside pen, higher numbers of calves per drinking nipple, mechanical ventilation, vaccination against bovine respiratory disease, and a maximum ammonia value >10 ppm in the calf pen. In addition, a higher number of birth farms and calf purchase from markets were associated with increased TI in the univariable analysis.The identified risk factors associated with increased TI and mortality and with decreased ADG should be addressed in priority in veal calf operations to improve calf health and reduce antimicrobial use.

Animal performance and economic implications of alternative production systems for dairy bulls slaughtered at 15 months of age

AbstractThe objectives of this experiment were to investigate (i) the influence of varying levels of concentrate supplementation during the grazing season, (ii) alternative finishing strategies for dairy bulls slaughtered at 15 mo of age and (iii) economic implications of these management strategies. Bulls were assigned to a 2 (level of concentrate supplementation during the grazing season: 1 kg [LA] and 2 kg [HA] dry matter [DM]/head daily) × 2 (finishing strategies: concentrates ad libitum group [AL] or grass silage ad libitum plus 5 kg DM of concentrates/head daily group [SC]) factorial arrangement of treatments. Average daily gain (ADG) during the grazing season was greater (P &lt; 0.01) for HA than for LA. Consequently, HA bulls were 16 kg heavier at housing: 214 and 230 kg, respectively (P &lt; 0.05). During the finishing period, ADG tended (P = 0.09) to be greater for LA than for HA. Carcass weight tended (P = 0.08) to be greater for HA than for LA. Fat score was greater for HA. Live weight at slaughter (P &lt; 0.001) and carcass weight (P &lt; 0.001) were 41 and 23 kg greater for AL than for SC, respectively. Conformation (P &lt; 0.05) and fat score (P &lt; 0.05) were greater for AL than for SC. The Grange Dairy Beef Systems Model simulated whole-farm system effects of the production systems. Net margin/head was greater for LA than for HA and greater for SC than for AL. Sensitivity analysis of finishing concentrate price, calf purchase price and beef price showed no re-ranking of the systems on a net margin basis. Although greater animal performance was observed from the higher plane of nutrition, overall profitability was lower.

Optimization of a genomic breeding program for a moderately sized dairy cattle population

Although it now standard practice to genotype thousands of female calves, genotyping of bull calves is generally limited to progeny of elite cows. In addition to genotyping costs, increasing the pool of candidate sires requires purchase, isolation, and identification of calves until selection decisions are made. We economically optimized via simulation a genomic breeding program for a population of approximately 120,000 milk-recorded cows, corresponding to the Israeli Holstein population. All 30,000 heifers and 60,000 older cows of parities 1 to 3 were potential bull dams. Animals were assumed to have genetic evaluations for a trait with heritability of 0.25 derived by an animal model evaluation of the population. Only bull calves were assumed to be genotyped. A pseudo-phenotype corresponding to each animal's genetic evaluation was generated, consisting of the animal's genetic value plus a residual with variance set to obtain the assumed reliability for each group of animals. Between 4 and 15 bulls and between 200 and 27,000 cows with the highest pseudo-phenotypes were selected as candidate bull parents. For all progeny of the founder animals, genetic values were simulated as the mean of the parental values plus a Mendelian sampling effect with variance of 0.5. A probability of 0.3 for a healthy bull calf per mating, and a genomic reliability of 0.43 were assumed. The 40 bull calves with the highest genomic evaluations were selected for general service for 1 yr. Costs included genotyping of candidate bulls and their dams, purchase of the calves from the farmers, and identification. Costs of raising culled calves were partially recovered by resale for beef. Annual costs were estimated as $10,922 + $305 × candidate bulls. Nominal profit per cow per genetic standard deviation was $106. Economic optimum with a discount rate of 5%, first returns after 4 yr, and a profit horizon of 15 yr were obtained with genotyping 1,620 to 1,750 calves for all numbers of bull sires. However, 95% of the optimal profit can be achieved with only 240 to 300 calves. The higher reliabilities achieved through addition of genomic information to the selection process contribute not only in obtaining higher genetic gain, but also in obtaining higher absolute profits. In addition, the optimal profits are obtained for a lower number of calves born in each generation. Inbreeding, as allowed within genomic selection for the Israeli herd, had virtually no effect on genetic gain or on profits, when compared with the case of exclusion of all matings that generate inbreeding. Annual response to selection ranged from 0.35 to 0.4 genetic standard deviation for 4 to 15 bull sires, as compared with 0.25 to 0.3 for a comparable half-sib design without genomic selection.

Energy Analysis and Measurement of the Greenhouse Gas Emissions of Livestock Systems. A Comparison of Different Livestock Systems in the Eastern Brazilian Amazon

Energy Analysis and Measurement of the Greenhouse Gas Emissions of Livestock Systems. A Comparison of Different Livestock Systems in the Eastern Brazilian Amazon Carine Pachoud, René Poccard-Chapuis, Thierry Bonaudo, Jean-François Tourrand, Rogério Martins Mauricio Abstract This paper introduces an assessment method based on the Planet method (2002). It aims to measure the energy inputs and outputs, their conversion efficiencies and the greenhouse gas (GHG) emissions in agricultural systems at the farm level. The method was applied to compare smallholder mixed dairy-beef livestock systems (SM) with two extensive and highly technical beef breeding-fattening (BB) and fattening (BF) systems, in the Eastern part of the Brazilian Amazon. It appears that SM farms are the lowest-level input system (13 koe ha-1 of pasture); therefore, they do not require substantial amounts of fossil-energy to produce the outputs. The BF system is the highest level inputs user (60 koe ha-1 of pasture). No significant difference was found for the BB system when compared to the BF and SM systems (38 koe ha-1 of pasture). In regards to the energy outputs, the SM system had the lowest production per hectare of pasture (30 koe ha-1 of pasture), while the BB system had an intermediate amount of energy production (68 koe ha-1 of pasture), and the BF system had the highest production (129 koe ha-1 of pasture). The only output from the BB and BF systems is beef, while the SM system produces beef obtained from the sale of male calves to the BF farms and also dairy products on the local market (essentially cheese). No significant difference was found between the three systems in terms of energy efficiency (average of 2.3). Finally, the GHG emissions were the highest for the BF system (7814 kg CO2 ha-1 of pasture), intermediate for the BB system (2619 kg of CO2 ha-1 of pasture), and the lowest for the SM system (1702 kg of CO2 ha-1 of pasture). The major source of emissions differed for the three systems - burning practices for the SM farms; enteric fermentation for the BB farms; and the purchase of calves and burning practices for two-thirds and one-third of the BF farms, respectively. The energy inputs and outputs and GHG emissions expressed per ton of live weight produced were compared between the BB and the BF systems. No significant differences were found for the four indicators. According to other analyses, the three systems studied are low-level fossil energy users. Full Text: PDF DOI: 10.15640/jaes.v6n1a3

Effect of calf purchase and other herd-level risk factors on mortality, unwanted early slaughter, and use of antimicrobial group treatments in Swiss veal calf operations

The objective of this survey was to determine herd level risk factors for mortality, unwanted early slaughter, and metaphylactic application of antimicrobial group therapy in Swiss veal calves in 2013. A questionnaire regarding farm structure, farm management, mortality and antimicrobial use was sent to all farmers registered in a Swiss label program setting requirements for improved animal welfare and sustainability. Risk factors were determined by multivariable logistic regression. A total of 619 veal producers returned a useable questionnaire (response rate=28.5%), of which 40.9% only fattened their own calves (group O), 56.9% their own calves and additional purchased calves (group O&P), and 2.3% only purchased calves for fattening (group P). A total number of 19,077 calves entered the fattening units in 2013, of which 21.7%, 66.7%, and 11.6% belonged to groups O, O&P, and P, respectively.Mortality was 0% in 322 herds (52.0%), between 0% and 3% in 47 herds (7.6%), and ≥3% in 250 herds (40.4%). Significant risk factors for mortality were purchasing calves, herd size, higher incidence of BRD, and access to an outside pen. Metaphylaxis was used on 13.4% of the farms (7.9% only upon arrival, 4.4% only later in the fattening period, 1.1% upon arrival and later), in 3.2% of the herds of group O, 17.9% of those in group O&P, and 92.9% of those of group P. Application of metaphylaxis upon arrival was positively associated with purchase (OR=8.9) and herd size (OR=1.2 per 10 calves). Metaphylaxis later in the production cycle was positively associated with group size (OR=2.9) and risk of respiratory disease (OR=1.2 per 10% higher risk) and negatively with the use of individual antimicrobial treatment (OR=0.3).In many countries, purchase and a large herd size are inherently connected to veal production. The Swiss situation with large commercial but also smaller herds with little or no purchase of calves made it possible to investigate the effect of these factors on mortality and antimicrobial drug use. The results of this study show that a system where small farms raise the calves from their own herds has a substantial potential to improve animal health and reduce antimicrobial drug use.

Antimicrobial Resistance in Bacteria from Swiss Veal Calves at Slaughter

Bacteria with antimicrobial resistance can be transferred from animals to humans and may compromise antimicrobial treatment in case of infection. To determine the antimicrobial resistance situation in bacteria from Swiss veal calves, faecal samples from 500 randomly selected calves originating from 129 farms were collected at four big slaughterhouses. Samples were cultured for Escherichia coli, Enterococcus sp. and Campylobacter sp. and isolated strains were tested for antimicrobial susceptibility to selected antimicrobial agents by the minimal inhibitory concentration technique using the broth microdilution method. From 100 farms, data on farm management, animal husbandry and antimicrobial treatments of the calves were collected by questionnaire. Risk factors associated with antimicrobial resistance were identified by logistic regression. In total, 467 E. coli, 413 Enterococcus sp. and 202 Campylobacter sp. were isolated. Of those, 68.7%, 98.7% and 67.8%, respectively, were resistant to at least one of the tested antimicrobial agents. Resistance was mainly observed to antimicrobials frequently used in farm animals. Prevalence of resistance to antimicrobials important for human treatment was generally low. However, a rather high number of quinupristin/dalfopristin-resistant Enterococcus faecium and ciprofloxacin-resistant Campylobacter sp. were detected. External calf purchase, large finishing groups, feeding of milk by-products and administration of antimicrobials through feed upon arrival of the animals on the farm significantly increased the risk of antimicrobial resistance at farm level. Participation in a quality assurance programme and injection of a macrolide upon arrival of the animals on the farm had a protective effect. The present study showed that veal calves may serve as a reservoir for resistant bacteria. To ensure food safety, veal calves should be included in the national monitoring programme for antimicrobial resistance in farm animals. By improving farm management and calf husbandry the prevalence of resistance may be reduced.

Influence of arrival weight, season and calf supplier on survival in Holstein beef calves on a calf ranch in California, USA

On a yearly basis, large calf ranches rear thousands of neonatal cattle for replacement heifers, veal or dairy beef. Dairy beef ranches obtain bull–calves from multiple sources and with questionable colostrum intake histories. Such ranches accumulate large amounts of data that could be used to help them with calf purchasing and on-farm management practices to avoid losses. Our purpose was to describe some calf purchase factors associated with mortality in neonatal calves raised on a single large calf ranch. Computerized records describing 120,197 bull–calves purchased between January 1997 and November 1998 were used in a survival analysis. Risk factors for mortality within the first 4 weeks after arrival on the ranch included body weight on arrival, month of arrival, and the calf supplier. The strength of the effects was conditional on the week after arrival to the ranch.

An economic evaluation of the differences between intensive and extensive beef production systems.

A model to evaluate economic criteria involved when cattle are raised on high-forage diets prior to finishing or finished directly after weaning was developed using data from two experiments. In Exp. 1, each year for 3 yr, 136 Charolais-cross calves were weaned and allotted to either an intensive system, in which they were immediately finished on a high-grain diet, or an extensive system, in which they were wintered on crop residues, grazed on summer pasture and finished on a high-grain diet. In Exp. 2, 160 British breed steers were wintered, in one of eight different wintering systems utilizing crop residues, using supplemental protein and(or) alfalfa hay. After wintering, the steers grazed summer pasture and then were finished on a high-grain diet. Overall cost of gain and final "break-even" price were lower for cattle finished through the extensive system except when the price of corn was very low in relationship to other inputs. Interest costs were higher for cattle in the extensive system. Increasing the feeder calf purchase price had almost no effect on differences between the systems. Corn price and purchase price affected both systems similarly, whereas interest rate, wintering yardage and finishing yardage affected each system differently. Because of the additional weight produced through the extensive system, it yielded lower final "break-even" prices in most situations.

POSTWEANING GAIN AND FEED EFFICIENCY OF CROSSBRED BULLS, STEERS AND HEIFERS FROM CHAROLAIS, SIMMENTAL AND LIMOUSIN SIRES MATED TO HEREFORD, ANGUS AND SHORTHORN DAMS

Postweaning gain and feed efficiency results are reported from an evaluation of crossbred calves sired by Charolais, Simmental and Limousin bulls and born to Hereford, Angus and Shorthorn cows in 48 herds located throughout the Canadian Prairie Provinces. Bull, steer and heifer calves were weaned at approximately 7 mo of age and transported to the Brandon or the Lacombe Research Stations where their performance was measured during a 112-d postweaning test period in which male calves were fed a high-energy feedlot diet and heifers were developed as breeding females on a lower energy diet. The data, which did not represent all sire breeds or sexes in all station years, were analyzed in eight separate data sets for gain and five for feed efficiency. Interpretation is based on paired comparisons of breed crosses within data set. In general, Limousin-sired male calves gained an average of 14.0 kg less than Charolais-sired and 9.6 kg less than Simmental-sired male calves from comparable dams, while Charolais-sired and Simmental-sired male calves performed equally. The same breed-of-sire pattern was apparent in heifer calves fed a lower energy diet, but the effects were smaller and were significant less often. Breed-of-dam effects were apparent for on-test weight, but not for gain during the test period. There were no consistent breed-of-sire differences in feed conversion ratio. The cost to the feeder of the slower gain exhibited by the Limousin-sired calves in this experiment could be offset by the lower calf purchase weight, depending on the premium, if any, paid on the price per kg for the lighter calves. Key words: Beef cattle, breed comparison, post-weaning growth, feed efficiency

Bovine leucosis virus contamination of a vaccine produced in vivo against bovine babesiosis and anaplasmosis

Contamination of a batch of tick fever (babesiosis and anaplasmosis) vaccine with bovine leucosis virus (BLV) was detected when a herd, in the final stages of an enzootic bovine leucosis (EBL) accreditation program, developed a large number of seropositive cattle following use of tick fever vaccine. Investigations incriminated a single calf used to produce Anaplasma centrale vaccine from which 13,959 doses were distributed. The failure of this calf to give a positive agar gel immunodiffusion (AGID) test before use was not fully explained. A total of 22,627 cattle from 111 herds receiving contaminated vaccine was tested to validate claims for compensation. Results showed infection rates of 62% and 51.8% in vaccinated dairy and beef cattle, respectively, compared with 6.1% and 1.5% in non-vaccinated cattle in the same herds. The results also indicated that infection did not spread from vaccinated to non-vaccinated in-contact cattle. Heavy reliance is now placed on purchase of calves for vaccine production from EBL accredited-free herds and on transmission tests from the calves to sheep to prevent a recurrence of contamination. The need for a BLV antigen detection test, with the sensitivity of the sheep transmission test but simpler and faster to perform, is evident.

Effect of calf purchase weight, serum IG level and feeding systems on the incidence of diarrhoea, respiratory disease and mortality

A survey was conducted on 5100 purchased male Friesian calves in the period of 1976 to 1985 to determine the effect of serum immunoglobulin (Ig) level (low 15 ZST units or high 15 ZST units), purchase weight (light 40 kg or heavy 40 kg) and feeding system (bucket or ad libitum) on the occurrence of diarrhea, respiratory disease and mortality in the period 1 to 49 days following purchase. In the low and high Ig categories the respective proportions were 0.21 and 0.14, 0.6 and 0.28, 0.11 and 0.03 for diarrhea, respiratory disease and mortality. The corresponding values for light and heavy calves were 0.26 and 0.14, 0.30 and 0.32, 0.09 and 0.04. Similarly for bucket and ad libitum calves the respective values were 0.15 and 0.17, 0.28 and 0.34, 0.05 and 0.06.