Genetic and non-genetic sources of variation in yield and composition of milk in Verata goats

Genetic and phenotypic parameters of milk yield, milk composition and age at first kidding in Saanen goats from Mexico

“…The phenotypic correlations between MILK and FAT (0.85 ± 0.01) and between MILK and PROT (0.95 ± 0.01) were high and positive, in agreement with other authors who have estimated these in a range varying from 0.80 to 0.96 (Boichard et al, 1989;Rabasco et al, 1993;Muller et al, 2002;Bagnicka et al, 2004;Delgado et al, 2006).…”

Estimation of genetic and phenotypic parameters for daily milk yield of Black Bengal does

“…The results of this study were in accordance with the findings of other studies made in the tropics (10,12). This study also agrees with the results of Zaraibi goats in Egypt (13), of Verata goats in Spain (14) and other Spanish breeds (15), and of Alpine and Saanen breeds in France (16). Peak milk yield was attained during the third parity, probably due to the increased animal size (greater digestive capacity) and udder combined with advancing age, which led to the development of the mammary glands (an increase in the number of alveoli and muscle fibers in a limb).…”

“…Early literature reviews of heritabilities of milk yield in dairy goats (29) reported estimates ranging from 0.16 to 0.60 with an unweighted mean value of 0.32. Later references reported heritabilities of milk yield in the range of 0.18-0.32 (14,18,22,30). Estimates by the REML method ranged from 0.29 to 0.31 (19).…”

Estimation of genetic parameters and genetic trends for milk yield traits in Jamunapari goats in semiarid tropics

“…Furthermore, genetic parameters for yield traits in dairy goats have been estimated for other populations in South Africa, New Zealand and Norway ( Muller et al, 2002 , Morris et al, 2006 , Andonov et al, 2007 ). The genetic parameters of milk yield traits have been reported in different local goats in different countries ( Selvaggi and Dario, 2015 , Mavrogenis et al, 1989 , Brito et al, 2011 , Kala and Prakash, 1990 , Rabasco et al, 1993 , Valencia et al, 2007 ). Despite the importance of goat milk for nutritional and livelihood security, there is still limited information on genetic and phenotypic parameters of milk yield and composition traits in different Indian indigenous breeds.…”