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Research Article
 

Serum Cortisol Concentration in Different Sex-Types and Slaughter Weights, and its Relationship with Meat Quality and Intramuscular Fatty Acid Profile



N.J. Okeudo and B.W. Moss
 
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ABSTRACT

A group of 84 crossbred lambs comprising 21 lambs for each of 4 sex-types (entire ram, vasectomized ram, castrate and ewe) were subdivided within each sex-type into 7 slaughter weights (32, 36, 40, 44, 48, 52, 56 kg). There were 3 lambs per slaughter weight. Lambs were born in the latter part of spring and were out on pasture with their dams, but were housed by September and fed a concentrate diet and hay. Lambs were slaughtered in a nearly abattoir and blood samples were collected for cortisol determination. Meat quality and fatty acid profile were assessed using the 6th-12th rib section of the Longissimus dorsi muscle. The mean serum cortisol concentrations ranged from 103.3-117.7 nMol L-1 and differences due to sex - type were not significant (P>0.05). However, serum cortisol concentration was positively correlated with slaughter weight (r = 0.34, P<0.01) and age (r = 0.43, P<0.001). Whereas serum cortisol level was negatively correlated with initial pH and positively correlated with intramuscular fat in castrates (P<0.05), the same correlations in other sex-types were not significant (P>0.05). Cortisol level was negatively correlated with cooking loss in all sex-types (P < 0.01) and also significantly related to fatty acid profile (P<0.05).

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  How to cite this article:

N.J. Okeudo and B.W. Moss , 2005. Serum Cortisol Concentration in Different Sex-Types and Slaughter Weights, and its Relationship with Meat Quality and Intramuscular Fatty Acid Profile. Pakistan Journal of Nutrition, 4: 64-68.

DOI: 10.3923/pjn.2005.64.68

URL: https://scialert.net/abstract/?doi=pjn.2005.64.68

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