Genetic parameters of 305 days and monthly test-day milk yields in Murrah buffaloes

MANVENDRA SINGH; AVTAR SINGH; A K GUPTA; S K DASH; P R SHIVAHRE; SAROJ KU SAHOO; G S AMBHORE

doi:10.56093/ijans.v86i1.55014

Authors

MANVENDRA SINGH ICAR-National Dairy Research Institute, Karnal, Haryana 132 001 India
AVTAR SINGH ICAR-National Dairy Research Institute, Karnal, Haryana 132 001 India
A K GUPTA ICAR-National Dairy Research Institute, Karnal, Haryana 132 001 India
S K DASH ICAR-National Dairy Research Institute, Karnal, Haryana 132 001 India
P R SHIVAHRE ICAR-National Dairy Research Institute, Karnal, Haryana 132 001 India
SAROJ KU SAHOO ICAR-National Dairy Research Institute, Karnal, Haryana 132 001 India
G S AMBHORE ICAR-National Dairy Research Institute, Karnal, Haryana 132 001 India

https://doi.org/10.56093/ijans.v86i1.55014

Keywords:

305 days milk yield, Buffaloes, Genetic estimates, Monthly test-day milk yields, Murrah

Abstract

The present investigation was carried out using first lactation 9,071 monthly test-day milk yield records of 965 Murrah buffaloes that calved from 1977 to 2012 sired by 98 bulls maintained at ICAR-National Dairy Research Institute, Karnal. Mixed model analysis was carried out by least-squares maximum likelihood programme to study the effects of genetic and non-genetic factors on first lactation 305-day milk yield and monthly test-day (TD) milk yield records of Murrah buffaloes. The highest monthly test-day milk yield was observed in TD₃ (7.64 kg) and lowest in TD₁₀ (4.46 kg). The average first lactation 305 days or less milk yield (FL305DMY) was 1806.45±16.99 kg. The effect of season of calving, period of calving and age at first calving was highly significant on FL305DMY and on most of the monthly test-day milk yields. The heritability estimate for FL305DMY was 0.18±0.08 and for monthly test-day milk yields it ranged from 0.09 (TD₆) to 0.18 (TD₃). The genetic and phenotypic correlations among monthly test-day milk yields and with 305 days milk yield were highly significant. The present investigation revealed that the non-genetic factors such as season of calving in general and year of calving in particular, might be considered when performing an evaluation of Murrah buffaloes based on monthly test-day milk yield records. High genetic and phenotypic correlation among monthly test-day milk yields and with first lactation 305 days milk yield suggested that these test-day yields could be used as the selection criteria, leading to a reduction in generation interval.

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