TY - JOUR
T1 - Milk composition and its relationship with weaning weight in Charolais cattle
AU - Contreras, Víctor Inocencio Pacheco
AU - Bracamonte, Gaspar Manuel Parra
AU - Bustamante, Luis Arístides López
AU - Medina, Víctor Ricardo Moreno
AU - Rincón, Ana María Sifuentes
N1 - Publisher Copyright:
© 2015 Sociedade Brasileira de Zootecnia.
PY - 2015
Y1 - 2015
N2 - To determine the effects of a number of non-genetic factors on milk components and estimate their indirect relationships with weaning weight (WW205), the percentages of protein, fat, lactose and solids non-fat in Charolais cows from Mexico were estimated. Lactation period (LP) and calving season (CS) had significant effects on protein and fat, whereas lactose and solids non-fat were only affected by the LP. Sire line and age of the dam had significant effects on calf birth weight, while CS affected WW205. Residual correlations between milk components and WW205 suggest a low but significant correlation with lactose. These results demonstrate the importance of several non-genetic factors on the composition of milk from Charolais cows managed under extensive cow-calf production systems and the indirect relationships between these factors and the weaning weight of a calf.
AB - To determine the effects of a number of non-genetic factors on milk components and estimate their indirect relationships with weaning weight (WW205), the percentages of protein, fat, lactose and solids non-fat in Charolais cows from Mexico were estimated. Lactation period (LP) and calving season (CS) had significant effects on protein and fat, whereas lactose and solids non-fat were only affected by the LP. Sire line and age of the dam had significant effects on calf birth weight, while CS affected WW205. Residual correlations between milk components and WW205 suggest a low but significant correlation with lactose. These results demonstrate the importance of several non-genetic factors on the composition of milk from Charolais cows managed under extensive cow-calf production systems and the indirect relationships between these factors and the weaning weight of a calf.
KW - Beef cattle
KW - Lactation curve
KW - Milk components
UR - http://www.scopus.com/inward/record.url?scp=84934763694&partnerID=8YFLogxK
U2 - 10.1590/S1806-92902015000600002
DO - 10.1590/S1806-92902015000600002
M3 - Artículo
SN - 1516-3598
VL - 44
SP - 207
EP - 212
JO - Revista Brasileira de Zootecnia
JF - Revista Brasileira de Zootecnia
IS - 6
ER -