2 articles for “Age at First Calving”

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Research ArticleOpen accessIn the keywordsRelationship of Longevity with Productive and Reproductive Variables in Nelore Cows of the Bolivian TropicIkeda Atsuko, Barbona Ivana, Yoichiro Hayashi et al.The objective of this study was to evaluate the relationship between longevity with productive and reproductive efficiency variables of Nelore cows in grazing systems in the Bolivian tropics. Retrospective data corresponding to the period 1992-2019, belonging to the Cooperativa Agropecuaria Integral San Juan de Yapacaní and the Foundation Technology Center on Agriculture and Livestock, Santa Cruz-Bolivia were used. The data … …American Journal of Animal and Veterinary Sciences, Vol. 15, Issue 4 · 2 Dec 2020 · 6,626 accessesView PDF Cite

Research ArticleOpen accessIn the abstractFeatures of Growth and Development in Heifers of Holstein and Black-and-White BreedsElena A. Babich, Berik S. Aryngaziev, Lyudmila Y. Ovchinnikova, Alexander A. OvchinnikovThe study of the characteristics of the growth and development of farm animals is of interest in breeding, as it will help to improve animal breeds, as well as serve for the organization of fast and economically rational raising of productive livestock. The research aims to study the characteristics of growth and development and indicators of reproduction of the Holstein … …OnLine Journal of Biological Sciences, Vol. 22, Issue 4 · 8 Dec 2022 · 4,776 accessesView PDF Cite