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Estimation of heritabilities and correlations of partial & 300 days first lactation milk yield in Murrah buffaloes


, : Estimation of heritabilities and correlations of partial & 300 days first lactation milk yield in Murrah buffaloes. Journal of Dairying, Foods and Home Sciences 11(1): 43-49

1926 first-lactation records of Murrah buffalo cows at 8 military farms, sired by 82 bulls, were analysed. The hsuperscript 2s of unadjusted milk yield at 30, 60, 90, 120, 150, 180, 210, 240, 270 and 300 days of lactation were 0.55, 0.48, 0.49, 0.46, 0.41, 0.37, 0.32. 0.29, 0.26 and 0.27 respectively. Adjustment of the data for farm, period and age produced very low hsuperscript 2s, some of which were negative.

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Related references

Iype, S.; Nagarcenkar, R., 1992: Estimation of heritabilities and correlations of partial and 300 days first lactation milk yield in Murrah buffaloes. For estimation of genetic parameters from the analysis of data from a sample obtained from the population, care should be exercised to discriminate which of the effects of environmental factors should be considered in adjustment of the data. It is...

Arora, S.P.; Bajpai, L.D.; Muley, A.R., 1962: Influence of dry period on milk yield and effect of season on lactation yield and lactation days of Murrah buffaloes. Data on 1321 lactations of 301 buffaloes at the Military Dairy farm at Jabalpur were analysed. Yields ranged from 3825 1b. milk in the 1st lactation to 5642 1b. in the 6th, and length of the succeeding dry period from 68. 6 days after the 10th lac...

Reddy, C.E.; Taneja, V.K., 1982: Genetic trends for 300 days first lactation milk yield in Murrah buffaloes. Records of 784 Murrah buffaloes between 1941 and 1977 were used to estimate the annual phenotypic and genetic improvement trends in 1st-lactation, 300-day milk yield. The 4 regression methods used each gave a different result. The genetic trend by...

Iype, S.; Nagarcenkar, R., 1992: Influence of non-genetic factors on part and 300 days first lactation milk yield in Murrah buffaloes. For 1926 buffaloes in 8 herds, calving in 1959-75, first-lactation 300-day milk yield averaged 1457.9+or-9.1 kg, and yields to 90, 100, 200 and 210 days accounted for 38, 42, 79 and 82% respectively of total lactation yield. All yields (part and t...

Khan, F.H.; Johar, K.S., 1985: Effectiveness of partial milk yield of first lactation in selection for milk in Murrah buffaloes. Data on milk yields in 30, 60, 90, 120, 150, 180, 210, 240, 270 and 300 days of 1st lactation of 411 Murrah buffaloes recorded in 1962-1976 were analysed. Relative improvement in milk yield from indirect selection based on partial production was e...

Gaur, G.K.; Pandey, H.S.; Satish Kumar, 1998: Possibility of the use of part records in estimation of first lactation milk yield in Murrah buffaloes. The records of 76 first lactations (271-299 days; adjusted to 300 days) of Murrah buffaloes, raised at the Livestock Production Research (C & B), Indian Veterinary Research Institute from 1980 to 1994 were studied. Monthly yields for 9 months were...

Pal, S.; Basu, S.B.; Sengar, O.P.S., 1971: Heritabilities and genetic correlations for milk constituents in Murrah buffaloes. 172 milk samples were analysed from 43 buffalo cows sired by 12 bulls. Data were adjusted for age at calving and stage of lactation. Estimates of h2 were 0.47 for milk yield, 0.48 for fat percentage, and 0.74 for protein percentage. The genetic co...

Khan F.H.; Johar K.S., 1989: Indirect correlated response in first lactation milk yield using partial yields as basis for selection in murrah buffaloes. The data on partial milk yields of the first lactation at intervals of every 30 days starting from the first day of milk yield on 411 Murrah buffaloes spread over a period of 15 years from 1962-1976 from Secundrabad and Jabalpum Military Dairy Far...

Geetha, E.; Chakravarty, A.K., 2006: Random regression test day model for estimation of breeding values for persistency of first lactation milk yield in Murrah buffaloes. Random regression test day model was applied for estimating the breeding value for persistency of first lactation milk yield by using estimated daily breeding values for milk production in Murrah buffaloes. The average breeding value was estimated...

Iype, S.; Nagarcenkar, R., 1992: Evaluation of Murrah buffalo sires on the basis of 300 days and partial lactation milk yield records of daughters. First 100 and 200 days and cumulative monthly first lactation milk records from 30 to 300 days of daughters were used to rank Murrah buffao sires. Correlations of indices based on partial records with those of 300 days records were highly signific...