Abstract
The present study was carried out from selected areas at Rajshahi district to evaluate the reproductive performance of dairy cows in relation to breed/genotype, age, parity, body weight and body condition. A total of 500 cows selected and data were collected directly from the dairy farms owner by using pre-tested questionnaires during the period from September 2013 to December 2014. The average reproductive performance (RP) were recorded as age at puberty (AP) 26.42±0.22 m, age at first calving (AFC) 35.48±0.22 m, post-partum heat period (PPHP) 121.85±3.48 days, service per conception (S/C) 1.93±0.04, days open (DO) 136.80±3.57 days and calving interval (CI) 401.04±3.94 days. Genotype had significant effect (P<0.05) on all the reproductive traits except on S/C. Local (L) × Holstein Friesian (HF) genotype showed earlier AP and AFC than L× Sahiwal (SL) and L. Age group had significant (P<0.05) effect on AP, AFC and other parameters were not significant (P>0.05). Middle age groups of cows had shown better RP than others groups. Parities of cows had significant effect (P<0.05) on PPHP, S/C, DO except on AP, AFC and CI. Third parity had better RP than others. The best RP was found in >300 kg BW groups. Body condition score had significant effect (P<0.05) on all RP. Good body condition score (BCS) had excellent RP.
 Res. Agric., Livest. Fish.7(3): 481-495, December 2020
Highlights
Effects of breeds/genotypes on reproductive performance of dairy cows The effects of breeds on reproductive performance of dairy cows are summarized in Table 1 and Figure 1
We found age group had significant (P0.05) effect on post-partum heat period, service per conception days open and calving interval
The findings of present study were similar to the findings of Hammoud et al (2010), he observed the values of post-partum heat period, days open, calving interval, number of services per conception and age at first calving were 88.4 ± 1.1, 130.7 ± 1.9, 403.1 ± 1.9 days, 2.1 ± 0.1 services and 30.7 ± 0.1 months, respectively
Summary
Cattle are most available and versatile component providing a significant contribution to gross domestic, export products and raw materials for industries in relation to existing integrated agricultural farming system in Bangladesh. Reproduction, health and production i.e. calf and milk production are the principal factors affecting the profitability of a dairy herd. One prerequisite for effective health management is the accurate knowledge of factors that affect the health status of a cow, such as age, parity, body weight or health history, and of the relationship between health problems and other economically important traits, such as calf, milk production, reproduction, and length of productive life. The present study was undertaken and designed with the objectives of identification of reproductive performance of cows in relation to breed/genotype, age, parity, body weight and body condition available in selected areas of Rajshahi district of Bangladesh
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