Genetic and phenotypic correlations of feed efficiency with growth traits in Nellore cattle / Correlações genética e fenotípica entre características de eficiência alimentar e características de crescimento em bovinos Nelore
Matos Ceacero, Thaís; Noely dos Santos Gonçalves Cyrillo, Joslaine; Carrilho Canesin, Roberta; Morelli, Marcela; Galvão de Albuquerque, Lúcia; Eugênia Zerlotti Mercadante, Maria.
B. Indústr. Anim.;
71: 28-28, 2014.
Artigo
em Inglês
| VETINDEX
| ID: vti-467929
Resumo
Feed efficiency is difficult to evaluate because individual feeding are required. An alternative is selecting animals based on traits easier to obtain and genetically favorably correlated with feed efficiency traits. This study aimed to estimate genetic and phenotypic correlations between feed efficiency traits (residual feed intake RFI, feed efficiency FE and residual BW gain RG) with yearling weight (YW), hip height (HH) and girth circumference (GC) in Nellore cattle. Feed efficiency data set consisted of 887 records of DMI, ADG and BW0.75 obtained during performance tests (83 ± 15 d) to calculate RFI (0.005 ± 0.58 kg DM/d), FE (0.14 ± 0.03) and RG (0.00 ± 0.11 kg/d). FE was calculated as ADG and DMI ratio, RFI was estimated as the error of multiple regression of DMI on ADG and BW0.75, and RG was estimated as the error of multiple regression of ADG on DMI and BW0.75. The YW data set consisted of 7,948 records of males (314.45 ± 45.85 kg) and females (282.68 ± 48.19 kg) adjusted to 378 and 550 d of age, respectively. The HH consisted of 6,418 records of males (131.80 ± 5.40 cm) and females (132.51 ± 5.38 cm), and 3,745 records of GC of males (162.56 ± 8.48 cm) and females (167.72 ± 8.08 cm). Pedigree file contained 9,830 animals. Growth traits were analyzed as unit standard deviation of each sex/age. (Co)variance components were estimated through two-trait animal modelsO artigo não apresenta resumo em português.
Biblioteca responsável:
BR68.1
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