Year: 2017 | Month: April | Volume 7 | Issue 2
Effect of Non-genetic Factors on Test Day Milk Yield and First Lactation 305 Day Milk Yield in Jaffarabadi Buffaloes
Abstract:
The study was conducted on data of first lactation traits of 213 Jaffarabadi buffaloes spread over a period of 24 years (1991-2014) collected from the history -cum-pedigree registers maintained at Cattle Breeding Farm, Junagadh Agricultural University, Junagadh. Least squares maximum likelihood program was used to estimate non-genetic parameters affecting monthly test day yields and First lactation 305 day milk yield. The overall least squares mean for First lactation 305 day milk yield was 1477.33 ± 64.91 litre and was not found to be influenced by season of calving, period of calving and age at first calving. The overall least squares means for all 11 individual monthly test day yields varied from 2.76 ± 0.21 litre (1st test day) to 5.98 ± 0.29 litre (5th test day). The season of calving had significant effect (p<0.05) on milk yield on 3rd and 9th test day. Effect of period of calving was highly significant (p<0.01) on 2nd test day and significant (p<0.05) on 3rd test day. It was revealed that 8th & 9th test day showed highly significant (p<0.01) and significant (p<0.05) difference in test day milk yield due to age at first calving, respectively. All these non-genetic factors markedly affected the rising phase and declining phase of the first lactation over a period of time in the population due to change in climatic conditions and population structure. Hence, non-genetic factors were important to adjust some of the test day yields.
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