Direct and indirect nutritional factors that determine reproductive performance of heifer and primiparous cows.

ABSTRACT: Pregnancy rate is a major determinant of population dynamics of wild ungulates and of productivity of livestock systems. Allocation of feeding resources, including stocking rates, prior to and during the breeding season is a crucial determinant of this vital rate. Thus, quantification of effects and interaction among multiple factors that affect pregnancy rate is essential for management and conservation of pasture-based systems. Pregnancy rate of 2982 heifers and primiparous cows was studied as a function of animal category, average daily gain during the breeding season, stocking rate, pasture type and body weight at the beginning of the breeding season. Data were obtained from 43 experiments conducted in commercial ranches and research stations in the Pampas region between 1976 and 2015.

SUBMITTER: Eloy LR 

PROVIDER: S-EPMC9531839 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature