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              Open Access  
 
              
              
              
              Research 
              
              
(Published 
				online: 06-04-2016)  
              3. 
				
				
				Genetic and environmental causes of 
				variation in gestation length of Jersey crossbred cattle -
				
				
				Anshuman Kumar, Ajoy Mandal, A. K. Gupta and Poonam Ratwan 
              
              Veterinary World, 9(4): 351-355   
              
   
                
                
doi: 
              
				
				10.14202/vetworld.2016.351-355 
                
				  
				
				Anshuman Kumar: 
				
				Dairy Cattle Breeding Division, ICAR-National Dairy Research 
				Institute, Karnal, Haryana, India; anshuman.nanhe@gmail.com 
				
				Ajoy Mandal: 
				
				Animal Breeding Section, Eastern Regional Station, ICAR-National 
				Dairy Research Institute, Kalyani, West Bengal, India; 
				ajoymandal@rediffmail.com 
				
				A. K. Gupta: 
				
				Dairy Cattle Breeding Division, ICAR-National Dairy Research 
				Institute, Karnal, Haryana, India; guptaak2009@gmail.com 
				
				Poonam Ratwan: 
				
				Dairy Cattle Breeding Division, ICAR-National Dairy Research 
				Institute, Karnal, Haryana, India; punam.ratwan@gmail.com   
				
				Received: 16-11-2015, Revised: 26-02-2016, Accepted: 04-03-2016, 
				Published online: 06-04-2016 
				  
				
              	
              	Corresponding author:Anshuman Kumar, e-mail: anshuman.nanhe@gmail.com 
 
              Citation: 
				
				Kumar A, Mandal A, Gupta AK, Ratwan P (2016) Genetic and 
				environmental causes of variation in gestation length of Jersey 
				crossbred cattle, 
				
				Veterinary World, 9(4): 
				351-355. 
 
              
				Abstract 
 
				
				
				Aim: 
				
				The objective of this study was to investigate the effect of 
				genetic and non-genetic factors and estimate the genetic 
				parameter for gestation length (GL) of Jersey crossbred cattle. 
				
				
				Materials and Methods: 
				
				The data included the 986 parturition records on Jersey 
				crossbred cattle maintained at the Eastern Regional Station of 
				ICAR-National Dairy Research Institute, Kalyani, West Bengal, 
				India during 36 years (1978-2013). The data were analyzed 
				applying mixed model least square technique considering the 
				fixed effects of genetic group, season of calving, period of 
				calving, parity of animal, birth weight, and sex of calf born 
				from animal. The effect of sire was included as a random effect 
				in the model. 
				
				
				Results: 
				
				The genetic group of animal, season of calving, parity of 
				animal, and birth weight of calf born were found to be a 
				significant source of variation in the GL, whereas the period of 
				calving and sex of calf did not affect this trait. Cows with 
				<50% and >62.5% Jersey inheritance had the shortest and longest 
				GLs, respectively. Cows calved in summer and rainy season had 
				shorter GL than those calved in the winter season. Older cows in 
				4th parity carried calves for longer days than the cows in 1st 
				parity. The increase in calf birth weight significantly (p<0.01) 
				contributed to a linear increase in GL value in this study. The 
				heritability estimate of GL was 0.24±0.08. 
				
				
				Conclusion: 
				
				It can be concluded that selection for lower GL without 
				distressing future growth of calf can be used to reduce calving 
				difficulty, but a very small standard deviation of GL limits the 
				benefit. Moreover, more accurate prediction of calving date will 
				help in better management and health care of pregnant animals. 
				
				Keywords: 
				
				crossbred cattle, genetic and environmental factors, gestation 
				length, heritability. 
 
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