Abstract

Physiological and productive responses to recombinant bovine somatotropin (rbST) injection and calcium soap of fatty acids (CSFA) supplementation were studied in post-weaning male Rahmani lambs. Male lambs (n = 20) of similar initial body weight (27.9 kg) and age (162 d) were divided randomly into four equal groups. The first was fed the injected with 100 mg of rbST biweekly; the third (basal diet and served as control; the second (GH) was CSFA) was supplemented with 50 g/d of CSFA and the fourth (GH + CSFA) was injected with 100 mg of rbST biweekly plus 50 g/d of CSFA. Treatments increased the average daily gain and final body weight. Concentration of insulin-like growth factor-1 (IGF-1) in lambs treated with (GH) and (GH + CSFA) was higher than that of CSFA and control groups. Haematological parameters (RBC, WBC, and haemoglobin concentrations) did not change. Animals injected with rbST had higher serum total protein than other treated groups and controls. Control lambs showed the least serum albumin concentration. Injection of rbST and supplementation of CSFA increased serum glucose in treated lambs compared to controls. Serum urea concentration was not affected by injection of GH, while CSFA supplementation decreased serum urea concentration compared to the control. Serum triglycerides concentration decreased in rbST-injected lambs than other treatment groups. Lambs supplemented with CSFA only or combined with rbST had higher concentration of serum cholesterol than control or rbST-injected lambs. The results of the present study suggest that rbST and CSFA may increase the average daily gain and improve the physiological status of growing lambs.

Highlights

  • Administered somatotropin is one biotechnology tool that increases growth rate, improves feed efficiency, and increases the proportion of lean to fat tissue in the carcasses of lambs

  • Serum concentrations of insulin-like growth factor-1 (IGF-1) in lambs treated with GH and GH + calcium soap of fatty acids (CSFA) were higher (P

  • The current findings are in agreement with those reported by McLaughlin et al (1991) and Beermann et al (1990) who reported 16 – 18% increase in growth rates of growing lambs treated with recombinant bovine somatotropin (rbST)

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Summary

Introduction

Administered somatotropin is one biotechnology tool that increases growth rate, improves feed efficiency, and increases the proportion of lean to fat tissue in the carcasses of lambs Bypass fats are hydrolyzed to their polyunsaturated fatty acids and glycerol, a precursor for glucose (Morsy, 2008). Moallem et al (1997) reported that plasma urea concentrations were decreased in high producing dairy cows fed calcium soaps of fatty acids, reflecting the better utilization of amino acids as reviewed by Etherton & Bauman (1998). The objectives of this study were to determine the separate and combined mechanisms by which rbST administration and calcium soap of fatty acids affect growth rate, serum IGF-1 concentration, haematological parameters as well as serum biochemical parameters in growing Rahmani lambs

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