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1.
Trop Anim Health Prod ; 52(2): 743-751, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-31595384

RESUMO

The objective of this study was to assess aspects of the social behavior of a mixed-breed herd of beef cows as a potential source for stress and economic losses. Angus (AN; N = 10), Brahman (BR; N = 10), and Senepol (SE; N = 10) cows were assigned to two groups (N = 15 each containing equal breed numbers) on separate pastures. Agonistic interactions (win/loss) during feeding were recorded daily for 45 days. Dominance values were estimated as the proportion of individuals dominated to total herdmates. From this, individuals were placed into social categories based upon linear ranking as follows: dominants (D), intermediate (I), and subordinates (S). Breed influenced (P < 0.01) social category, with SE cows being dominants (P < 0.05) over AN and BR cows. Interactions between AN and BR cows were less (P < 0.0005) than interactions between AN and SE (53 vs 140, respectively). Within breeds, BR (152) and SE (182) cows had more (P < 0.0005) agonistic interactions than AN (107) cows. Although apparently influenced by breed, agonistic interactions occurred more frequently (P < 0.005) between social categories than within social categories (814 vs 310, respectively). Dominant cows were involved in more agonistic interactions with cows from different social categories than were intermediate and subordinate cows (P < 0.0005). However, intermediate (100) and subordinate (157) cows generated more (P < 0.0005) agonistic interactions within their own social category than dominant cows (53). It was concluded that, in mixed-breed herds, breed influences both social organization and agonistic interactions which could be considered as potential sources of stress and economic losses.


Assuntos
Criação de Animais Domésticos/métodos , Bovinos/fisiologia , Manobra Psicológica , Comportamento Social , Estresse Fisiológico/fisiologia , Comportamento Agonístico , Criação de Animais Domésticos/economia , Animais , Cruzamento , Bovinos/classificação , Bovinos/genética , Dominação-Subordinação , Feminino
2.
Vet Clin North Am Food Anim Pract ; 22(1): 53-74, 2006 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-16517296

RESUMO

This article examines the epidemiologic tools available to the cow-calf beef veterinarian (and cattle producer) to assess the performance of the beef cow herd and to examine ways in which these tools may be used.


Assuntos
Bem-Estar do Animal , Bovinos/fisiologia , Prenhez/fisiologia , Medicina Veterinária , Animais , Animais Recém-Nascidos/crescimento & desenvolvimento , Custos e Análise de Custo , Feminino , Gravidez , Complicações na Gravidez/epidemiologia , Complicações na Gravidez/prevenção & controle , Complicações na Gravidez/veterinária , Taxa de Gravidez/tendências , Medição de Risco , Taxa de Sobrevida/tendências , Desmame
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