International Journal of Agricultural Policy and Research
Vol.4 (8), pp. 143-148, August 2016
Available online at https://www.journalissues.org/IJAPR/
Article 16/ID/JPR053/06/ pages
Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.
Original Research Article
Genetic and phenotypic parameter s of first lactation and life time traits in crossbred cattle
Geeta Lodhi1, C.V. Singh*2, R.S. Barwal3 and B.N. Shahi4
Department of Animal Genetics and Breeding, College of Veterinary and Animal Sciences, G.B. Pant University of Agriculture and Technology, Pantnagar – 263 145 Distt. U.S. Nagar (Uttarakhand), India.
*Corresponding Author Email:cvsingh2010(at)gmail.com
Data for the present investigation were collected from history sheet of crossbred cattle maintained at instructional dairy farm of G. B. Pant University of Agriculture and Technology, Pantnagar. The data pertained to 1198 crossbred cattle from 102 sires were distributed over a period of 48 years from 1966 to 2010. Cows with abnormal and incomplete records were excluded from the study. The overall least squares mean of first lactation traits viz. AFC, FLMY, FLP, FDP and FCI were estimated to be1153.10 ± 24.84 days, 2733± 73.14kg, 320.46± 5.52 days, 113.06± 5.12 days, and 433.542 ± 7.91days respectively. The life time milk yield and life time lactation length were estimated as 10705.64±692.90kg and 1111.74±53.95 days respectively. Sire effect was significant on all the first lactation and life time traits. In contrast different genetic groups were found to have no significant influence on all the traits except first service period, similarly, season of calving was also found non-significant influence on all the traits except first lactation and life time milk yield. The period of calving were found to have significant influence on all the traits except first lactation milk yield. The heritability estimates of different first lactation traits were observed from low to high. The genetic and phenotypic correlations among all the traits were observed very low to high. The results of present study pointed out that most of variations in the traits were due to non-additive genetic variance. Therefore, improvement in these traits can be brought by the better management practices at the farm.
Key words: Crossbred cattle, first lactation milk yield, life time traits, least square means and heritability