Data/hora: 24/06/2024 22:30:03

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 02/03/1998
Data da última atualização: | 27/03/2017
Autoria: | BOYD, G. W.; LUNSTRA, D. D.; CORAH, L. R.; COCHRAN, R. C.; HAHN, G. L.
Título: | Serving capacity of crossbred yearling beef bulls. II.Summer grazing activity and body temperature patterns during average and heavy mating loads at pasture.
Ano de publicação: | 1989
Fonte/Imprenta: | Journal of Animal Science, v.67, n.1, p.72-79, 1989.
Idioma: | Inglês
Conteúdo: | Ten low (LSC) and 10 high (HSC) serving capacity yearling bulls were exposed individually to 25 natirally cyclic (N) cows for 3 d (average mating load) and subsequently to 9 estrus-synchronized (S) cows for 1 d )heavy mating load) in a randomized complete block design consisting of 10,4-d blocks. Bulls were fitted with vibracorders and temperature acquisition modules to record grazing activity and body temperature (BT), respectively. During the N cow treatment, LSC bulls had fewer (P < .05) services per cow and a higher mount to service ratio than HSC bulls, and LSC bulls tended (P = .12) to graze less total time than HSC bulls (7.8 vs 9.0 h/d, respectively). However, both groups of bulls exhibited similar diurnal grazing patterns with two major daily grazing periods; the first (0400 to 1300) peaked early in the morning (0600) and the second (1700 to 2200) occurred in late after-noon and evening. During the S cow treatment, LSC and HSC bulls did not differ (P = .60) in grazing time or pattern, but similar mating activity was exhibited by both SC groups while exposed to S cows. Bulls grazed little during the hottest part of the day (1300 to 1700), and LSC and HSC bulls spent only 2.2 and 2.4 h, respectively, grazing during dark, cooler periods near midnight. Body temperature did not differ between SC groups and averaged 39.3C during N cow treatment and 39.4C during S cow treatment. Body temperature had a distinct, monophasic diurnal pattern in bulls exposed to an average mating load. During exposure to S cows, BT pattern changed dramatically, and BT was .7 to 1.2C higher (P < .05) when bulls were enganged in heavy mating activity. We conclude that LSC and HSC bulls did not differ in grazing activity or BT pattern, but that patterns of grazing activity and BT may be interrelated and that BT pattern can be influenced by heaving mating activity.
Palavras-Chave: | Capacidade servindo; Comportamento; Touro de corte.
Thesagro: | Forragem; Temperatura do Corpo.
Thesaurus Nal: | beef bulls; behavior; body temperature; foraging; serving capacity.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (35312-1) - ADD - SP - PP - SP15510 -  - 15510 - DIS