| 
              
              
              Open Access  
 
              
              
              
              Research 
              
              
(Published 
				online: 12-06-2016)  
              8. 
				
				New insights on ill-thriftiness 
				in early-weaned buffalo calves -
				
				
				Nasr-Eldin M. Aref, 
				Ali El-Sebaie
				
				
				and Hammad Zaghloul Hammad 
              
              Veterinary World, 9(6): 579-586   
              
   
                
                
doi: 
              
				
				10.14202/vetworld.2016.579-586 
                
				  
				Nasr-Eldin M. 
				Aref:
				
              
              	Department of 
				Animal Medicine, Faculty of Veterinary Medicine, Assiut 
				University, Assiut, Egypt; 
              
              	nasreldeen.aref@vet.au.edu.eg 
				Ali El-Sebaie:
				
              
              Department of 
				Animal Medicine, Faculty of Veterinary Medicine, Assiut 
				University, Assiut, Egypt; 
              
              sebaie-ah@vet.au.edu.eg 
				Hammad Zaghloul 
				Hammad:
				
              
              Animal Health 
				Research Institute, Sohag, Egypt; azazy699@yahoo.com   
				
				Received: 31-01-2016, Accepted: 25-04-2016, Published online: 
				12-06-2016   
				
              	
              	Corresponding author: 
              	Nasr-Eldin 
				M. Aref, e-mail: nasreldeen.aref@vet.au.edu.eg 
 
              Citation: 
				
				Aref NM, El-Sebaie A, Hammad HZ (2016) New insights on 
				ill-thriftiness in early-weaned buffalo calves, Veterinary 
				World, 9(6): 579-586. 
 
              
				Abstract 
 
				Aim: 
				The present 
				study was designed to: (1) Investigate the effect of weaning 
				time on various metabolic indices and growth pattern in buffalo 
				calves compared to cow calves under field condition and (2) Shed 
				light on the potential relationship between early weaning, 
				growth metabolites, and suboptimal growth (ill-thrift) in 
				buffalo calves.  
				Materials and 
				Methods: 
				A total number 
				of 18 neonatal calves of both sexes and species (cattle and 
				buffalo) were included in the study. Animals were divided into 
				three groups according to their age at weaning as following: Cow 
				calves (n=8) weaned at 4.5 months, buffalo calves (n=6) weaned 
				at 3.5 months (early-weaned), and buffalo calves (n=4) weaned at 
				5.5 months (late-weaned). Morphological traits, growth 
				metabolites, and hormonal profile were measured at monthly 
				interval over the period of the study and around the time of 
				weaning (2 weeks pre- and post-weaning).  
				Results:
				The 
				obtained results showed that the trend of growth pattern was 
				significantly increased in a linear pattern in cow calves and 
				late-weaned buffalo calves, whereas early-weaned buffalo calves 
				showed sharp decline in their body weight (BW) post-weaning. By 
				the end of the study, early-weaned buffalo calves showed the 
				lowest BW gain (ill-thrift). There is a positive association 
				between the morphological traits and various growth metabolites 
				and hormonal indices. A significant decrease (p<0.05) in the 
				concentrations of growth hormones (insulin-like growth factor-1 
				[IGF-1] and insulin) and other metabolites were reported in 
				early-weaned buffalo calves compared to other animals. There is 
				no association between stress indices (cortisol level and 
				neutrophil to lymphocyte ratio) and growth rate.  
				Conclusion:
				
				Suboptimal growth rate (ill-thriftiness) is common in 
				early-weaned buffalo calves and is attributed to low blood 
				levels of growth metabolites, in particularly, IGF-1. In 
				addition, the strong positive associations between 
				concentrations of IGF-1 and morphological characters of growth 
				suggest that IGF-1 is a reliable indicator for assessing 
				metabolic status of individual calves.  
				
				Keywords: 
				
				calves, growth, hormone, insulin, insulin-like growth factor-1, 
				weaning. 
 
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