The present study was carried on milk production and milk constituents of 444 lactations of 176 Murrah buffaloes over a period of 10 years from 2001 to 2010 with the objective to find out the effect of various genetic and non-genetic factors on milk yield and milk constituents traits in Murrah buffaloes. &nbsp;Data on total milk yield, milk yield in 305 days or less, lactational average fat per cent and lactational average solid not fat percent (LSA) were collected and compiled purposely and analyzed with suitable statistical tool. Overall least square mean for all lactation traits of total milk yield (TMY), milk yield in 305 days or less (305MY), lactational average fat % (LFA) and lactational average solid not fat % (LSA) were 2253.88 &plusmn; 70.15 Kg, 2097.11 &plusmn; 59.12 Kg, 7.97 &plusmn; 0.02 % and 9.64 &plusmn; 0.01 % respectively. The &nbsp;period has significant effect on milk yield and milk constituent traits. Sire and parity affects significantly to TMY and 305MY, however, seasons were affecting to TMY only. Hence it is concluded as milk constituents (LFA and LSA) not affected by sire, parity and season. Although, sire and parity has affect on TMY and 305MY whereas season affects only TMY, therefore, due importance should be given to sire and parity during selection and genetic improvement of Murrah buffalo. Analysis among the parities also revealed that there were no significant (P&sup3;0.05) difference among the second, third and fourth parity hence, at the time of selection second lactation (305MY) milk yield is equally important as fourth lactation in which highest milk yield has been reported in present study.

Effect of genetic and non-genetic factors on milk yield and milk&nbsp;constituents in Murrah buffalo

The present study pertained to records on milk production and milk constituents of 259 Sahiwal cattle with 600 lactations spread over a period of 10 years from 2001 to 2010, collected from Dairy Cattle Breeding division of National Dairy Research Institute, Karnal, Haryana. To study the effect of various genetic and non-genetic factors on milk yield and milk constituents traits, mixed model least square analysis was used for analysis of data. Overall least square mean for all lactation traits of total milk yield (TMY), milk yield in 305 days or less (305MY), lactational average fat % (LFA) and lactational average solid not fat % (LSA) were 1880.39 &plusmn; 73.82 Kg, 1782.97 &plusmn; 68.37 Kg, 4.71 &plusmn; 0.01 % and 8.81 &plusmn; 0.01 % respectively. Analysis of variance showed that the differences were statistically significant for the effect of sire on TMY and 305MY; period on all the traits except TMY; parity on 305MY. However the effect of season of calving was not found significant on all the traits.

Effect of genetic and non-genetic factors on milk yield and milk constituents on Sahiwal cattle

In present study the effect of genetic polymorphism of Fatty acid synthase (FASN) gene on eight traits related to milk production and its composition in 162 Murrah buffaloes was studied. The traits studied includes 305 days milk yield, lactation fat average (LFA), 305 days fat yield (305LFY), lactation solid not fat average (LSA), 305 days solid not fat yield (305LSY), lactation total solid average (LTSA), 305 days total solid yield (305LTSY) and peak yield (PY). Restriction Fragment Length Polymorphism (RFLP) was used to identify the SNP in a 472 bp PCR amplified product of exon-40 in FASN gene. It was found to be polymorphic with Guanine to Adenine transition and three genotypes namely AA, AG and GG were observed. Allele A was found to be more frequent than G allele. We report for the first time that exon-40 FASN gene is associated with LFA, LTSA and peak yield in Murrah buffaloes. This information can augment future studies to determine the role of bovine FASN gene as a candidate gene marker for a milk fat, total solids and peak milk production.

Effect of genetic and non-genetic factors on milk yield and milk constituents in Murrah buffalo

Effect of genetic and non-genetic factors on milk yield and milk constituents on Sahiwal cattle

Influence of FASN gene polymorphism on milk production and its composition traits in Murrah buffaloes