Data/hora: 06/06/2024 12:10:27

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 27/11/2015
Data da última atualização: | 25/07/2017
Autoria: | RODRIGUES, W. B.; WECHSLER, F. S.; NOGUEIRA, E.
Afiliação: | UNESP; UNESP; ERIKLIS NOGUEIRA, CPAP.
Título: | Reproductive performance and reconception of Nellore cows according to their pure- or cross-bred calves.
Ano de publicação: | 2015
Fonte/Imprenta: | Reproduction in Domestic Animals, v. 50, n. 3, p. 431-436, 2015.
DOI: | 10.1111/rda.12509.
Idioma: | Inglês
Conteúdo: | The objective of the present research was to evaluate the effect of a calf?s genetic group on the productive and reproductive efficiency of its Nellore dam. Fixed-time artificial insemination was applied to 800 cows using semen extracted from Nellore, Simmental and Angus Red bulls. Four hundred eleven cows calved, producing 119 Nellore, 103 ½Simmental?½Nellore and 189 ½Nellore?½Angus Red calves. The second mating period, which paired Nellore cows with Simmental bulls, was initiated 10 days after parturitions began and lasted for 5 months. Based on the two successive parturitions, the cumulative parturition rate for calving periods of 3, 4 and 5 months was calculated. Although no significant difference was observed for birth weight among the genetic groups, cross-bred calves weighed, on average, 10% more than did pure-bred calves at the age of 205 days. Nellore dams experienced a gestation period that was 7 days longer than did the cross-bred dams, and the former showed a higher parturition rate at 90 and 120 days of the calving season, but not at 150 days (calving rates of 80.6, 76.4 and 76.2% for mothers of Nellore, ½Nellore?½Angus Red and ½Nellore?½Simmental, respectively, p > 0.05). At 90 and 120 days, Nellore dams produced more kg of calf per mated dam. In conclusion, in a short breeding season, Nellore dams nursing pure-bred Nellore calves were found to have a higher biological efficiency compared with Nellore dams nursing cross-bred calves.
Palavras-Chave: | Calf.
Thesaurus Nal: | Nellore; reproduction.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/134175/1/reproductive-performance-versao-early-view-03-2015.pdf
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (59458-1) - UPC - AP - PP - SP18135 -  - 18135 - DIS