Abdel-Khalek, A., Ashmawy, T., El-Gohary, E., Sallam, A., Teleb, D. (2009). EFFECT OF RECOMBINANT BOVINE SOMATOTROPIN TREATMENT ON MILK PRODUCTION AND REPRODUCTIVE PERFORMANCE OF EWES AND GROWTH PERFORMANCE OF THEIR OFFSPRINGS.. Journal of Animal and Poultry Production, 34(5), 4517-4532. doi: 10.21608/jappmu.2009.116993
A. E. Abdel-Khalek; T. A.M. Ashmawy; E. S.H. El-Gohary; A. A. Sallam; Doaa F. Teleb. "EFFECT OF RECOMBINANT BOVINE SOMATOTROPIN TREATMENT ON MILK PRODUCTION AND REPRODUCTIVE PERFORMANCE OF EWES AND GROWTH PERFORMANCE OF THEIR OFFSPRINGS.". Journal of Animal and Poultry Production, 34, 5, 2009, 4517-4532. doi: 10.21608/jappmu.2009.116993
Abdel-Khalek, A., Ashmawy, T., El-Gohary, E., Sallam, A., Teleb, D. (2009). 'EFFECT OF RECOMBINANT BOVINE SOMATOTROPIN TREATMENT ON MILK PRODUCTION AND REPRODUCTIVE PERFORMANCE OF EWES AND GROWTH PERFORMANCE OF THEIR OFFSPRINGS.', Journal of Animal and Poultry Production, 34(5), pp. 4517-4532. doi: 10.21608/jappmu.2009.116993
Abdel-Khalek, A., Ashmawy, T., El-Gohary, E., Sallam, A., Teleb, D. EFFECT OF RECOMBINANT BOVINE SOMATOTROPIN TREATMENT ON MILK PRODUCTION AND REPRODUCTIVE PERFORMANCE OF EWES AND GROWTH PERFORMANCE OF THEIR OFFSPRINGS.. Journal of Animal and Poultry Production, 2009; 34(5): 4517-4532. doi: 10.21608/jappmu.2009.116993
EFFECT OF RECOMBINANT BOVINE SOMATOTROPIN TREATMENT ON MILK PRODUCTION AND REPRODUCTIVE PERFORMANCE OF EWES AND GROWTH PERFORMANCE OF THEIR OFFSPRINGS.
1Animal Production Department, Faculty of Agric., Mansoura Univ.
2Animal Production Research Institute, Agricultural Research Center.
Abstract
This study was carried out to investigate the effect of administration of bovine somatotropin on milk yield, milk composition, reproductive performance of Rahmani crossbreed ewes, as well as, offspring growth. A total number of 40 mature healthy Rahmani crossbred ewes (1/2 Finnish Landrace x 1/2 Rahmani) aged from 3 to 4 years were divided into two similar groups (control and treatment). Ewes in the first group were injected with saline solution and served as a control, while those in the second group were s.c. injected with 160 mg recombinant bST at 14-day interval from one-month pre-partum until 3 months post-partum. Ewes were monitored for sign of oestrus and those observed in heat were mated using a fertile ram (breeding season from April to June). Milk yield and composition were determined throughout 8 lactation weeks. Results show that LBW of ewes at pre-partum and during the suckling period was not affected by rbST treatment, however, treated ewes were heavier (P<0.05) by about 5% than the control ones only during late post-partum. Administration of rbST increased (P<0.05) average daily milk yield of ewes during the 1st eight weeks of lactation, and the magnitude of the increase during the eight lactation weeks ranged between 16 to 33%. Milk fat, protein and total solids percentages were significantly lower (P<0.05) in treated than in control ewes. Meanwhile, lactose and ash contents did not differ significantly between the two groups. Male and female lambs of treated ewes were heavier (P<0.05) during the suckling period compared with those of the control group. Lambs of treated ewes reached the weaning weight (12 kg) earlier (at 6 and 7 weeks for male and female, respectively) than those of the control ewes (8 weeks). Average daily gain of male and female lambs of treated ewes was higher (221 and 182 g/day, respectively) than that of the control (163 and 170 g/day, respectively). Treatment with rbST increased (P<0.05) oestrus/mating rate (40 vs. 70%) and reduced post-partum period of lambing ewes by about one month as compared to untreated ewes. Moreover, ewes treated with rbST showed greater (P<0.05) number of ovarian follicles and corpus lutea (18 and 21) than that of the control ones (5 and 10), respectively. Lambing rate was lower (P<0.05) in control than in treated ewes (30 and 75 vs. 60 and 85.7%), respectively.
In conclusion,s.c. injection of 160 mg rbST at 14-day interval during one-month pre-partum and 3 months post-partum improved productive (milk yield) and reproductive (lambing rate) performance of ewes and their offspring growth.
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