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Association between IGF-IR gene polymorphisms and productive and reproductive traits in Holstein cows Arq. Bras. Med. Vet. Zootec.
Schoenau,W.; Porciuncula,P.M.; Zamberlan,G.; Mesquita,F.S.; Vieira,V.; Oliveira,J.F.C.; Gonçalves,P.B.D..
The association between single-strand conformation polymorphism (SSCP) in the gene of insulin-like growth factor-I receptor (IGF-IR) and age at first calving (AFC), calving interval (CI), lactation length (LL), and milk yield (MY) was studied using 106 graded Holstein females. The polimerase chain reaction (PCR) with specific initiating oligonucleotides, resulted an amplified fragment of 335pb. The population genotypes frequencies were 82.1% and 17.9%, for AA and AB genotypes, respectively. The frequency of A allele was 0.91 and 0.09 of B allele. No association between the identified polymorphism and AFC, CI, and MY was observed. The LL was positively associated (P<0.05) with the absence of B allele. Animals carrying the AA genotype presented a longer...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Beef cattle; Reproductive efficiency; Post-calving; Candidate gene.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352005000600011
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Natural and improved natural pastures on the reproductive performance of first-calf beef cows R. Bras. Zootec.
Tanure,Soraya; Pötter,Bernardo Augusto Albornoz; Lobato,José Fernando Piva.
This work evaluated the reproductive performance of first-calf cows at three years of age, submitted or not to protein supplementation at yearling on natural pastures. After calving, cows were managed on natural or improved pastures. The feeding managements were the following: on natural pastures as yearlings and during pregnancy, post-calving period and breeding season; on natural pastures with protein supplement as yearlings and only natural pasture during pregnancy, post-calving and breeding season; on natural pastures as yearlings and during pregnancy and on improved natural pastures (Lolium multiflorum L., Trifolium repens cv. Yi and Lotus corniculatus cv. São Gabriel) during the post-calving period and breeding season; on natural pastures with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Body condition score; Body weight variation; Braford; Post-calving; Pregnancy rate.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000300030
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