www.tjprc.org editor@tjprc.org ESTIMATES OF GENETIC PARAMETERS OF FIRST LACTATION TRAITS IN CROSSBREED HARDHENU (Bos Taurus x Bos indicus) CATTLE MANJEET 1 , B. L. PANDER 2 , KAMALDEEP 3 , R. SHARMA 4 , KAPIL DEV 5 S. S. DHAKA 6 & ANKIT MAGOTRA 7 1,5 Research Scholar, Department of Animal Genetics and Breeding, LUVAS, Hissar 2, Ex-Professor, Department of Animal Genetics and Breeding, LUVAS, Hissar 3 Research Scholar, Department of Animal Genetics and Breeding, LUVAS, Hissar 4 Ex-Director Research, LUVAS, Hisar 6 Professor, Department of Animal Genetics and Breeding, LUVAS, Hissar 7 Assistant Professor, Department of Animal Genetics and Breeding, LUVAS, Hissar ABSTRACT Records of 192 Hard henu cattle pertaining to first lactation traits over a period of 6years from 2008 to 2014were collected from history cum pedigree sheets maintained at Cattle breeding farm, Department of Animal Genetics and Breeding Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar. Data were analysed by LSML(Harvey, 1990) using mixed linear model having effect of sire as random and that of year and season of calving as fixed. The first lactation traits studied were first lactation milk yield (FLY), first lactation length (FLL) first service period (FSP) and first calving interval (FCI). The overall least squares means FLY, FLL, FSP and FCI were averaged as 2392.92±70.45 kg,317.70±15.87days, 160.20± 18.08 days and 448.90± 15.13 days, respectively. The effect of period of calving was not significant for all the first lactation traits under study except for FSP. Similarly, the effect of season of calving was not significant for all the first lactation traits except for FSP. The heritability estimates for different first lactation traits were obtained as 0.27±0.34, 0.14±0.39, 0.13±0.38and 0.21±0.26forFLY, FLL, FSP and FCI, respectively. The genetic correlation among first lactation traits were positive and varied from 0.16 to 0.59 except the genetic correlation of FLL with FSP and FCI which was low and negative. The phenotypic correlation among first lactation traits were low to high positive and varied from 0.11 to 0.76, respectively. KEYWORDS: Genetic Factors, Hard Henu, Non-Genetic Factors & First Lactation Traits Received: Oct 09, 2017; Accepted: Oct 28, 2017; Published: Nov 17, 2017; Paper Id.: IJASRDEC201734 INTRODUCTION India, with its 190.9 million heads of cattle has the largest cattle population in the world, out of which 39.73 thousand is comprised of crossbreed. The exotic/crossbred milch cattle increased from 14.4 million to 19.42 million, giving rise to an increase of 34.78% whereas the indigenous milch cattle increased marginally from 48.04 million to 48.12 million, an increase of 0.17% (19th livestock census-GOI). The economy of India is largely dependent on livestock. To improve the supply of milk and milk products cattle breeding has been implemented for several years. Genetic parameters are important tools for improving quantitative traits by selection. The estimates of genetic parameters are helpful in determining basis of selection. and the prediction of response and correlated response to selection. Original Article International Journal of Agricultural Science and Research (IJASR) ISSN (P): 2250-0057; ISSN (E): 2321-0087 Vol. 7, Issue 6, Dec 2017, 253-258 © TJPRC Pvt. Ltd