Abstract
The objective was to evaluate the influence of calving and postpartum characteristics, measured in different genetic predominance, on the postpartum rebreeding. Were evaluated 437 partum from cows that received feeding management consisting of a forage base of the native field and the mating season consisted of 90 days. The measurements were used from the data base (age of cow, genetic predominance, body weight, body condition score and date of calving) of the cows in the partum and postpartum period. The variables were submitted to analysis of multiple variances, multiple regression, correlation and cluster. Already the groups formed by cluster analysis were submitted to analysis of variance and F test and the means, compared by Student's t-test, α=0.05 probability. The increase in the mean at 0.14 points in the body condition score at calving and the occurrence of calving 9 days earlier at the calving season gives the Charolais genetically predominant cows repeat calves. The Nellore genetic predominance when they calved with similar body condition score (2.32 points) and showed a negative body weight gain at weaning (-3.0 kg and -2.1 kg) showed different behaviors, where they did not repeat the offspring, when they calved and weaned with smaller body weight.
Highlights
The improvement of the reproductive efficiency in bovine herds is recommended to reduce the age at the first service, to reduce the interval between calving and to increase the amount of kg of calf weaned/cow/year.The greatest obstacle to improve reproductive indexes is related to the inadequate nutrition of the animals involved in the breeding process (Recoules et al 2013)
There was no interaction in the analysis of multiple variance (MANOVA) (P
With similarity increase similar behaviors were observed between the Figures. This was verified by the formation of the groups in the following sequence of variables: previous calving condition (Empty vs. Pregnant), genetic predominance (Charolais vs. Nellore) and calving date in the calving season
Summary
The greatest obstacle to improve reproductive indexes is related to the inadequate nutrition of the animals involved in the breeding process (Recoules et al 2013). These animals are managed in Brazil in grazing areas that have low nutritional value and variations in annual vegetative growth (Tanure et al 2011), requiring knowledge of pastoral techniques. Poor reproductive performance reflecting in turn the production rates of the herd, resulting in lower yields of the activity. The nutritional adequacy of the animal can be observed through animal performance, in characteristics such as body weight gain and body condition score. Being the body condition score quantifying body reserves (Moraes et al 2013), An Acad Bras Cienc (2018) 90 (2 Suppl. 1)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
