Effect of hormone therapy on lambing performance of Zandi ewes at different ages under 3 lambing in 2 years schedule
Subject Areas : Journal of Large Animal Clinical Science Research(JLACSR)
Keywords: : Zandi sheep, lambing in 2 years, Hormone therapy, lamb production, ewe age,
Abstract :
To investigate the effect of hormone therapy and 3 lambing in 2 years schedule on lambing performance of Zandi ewes in different ages, 149 ewes were randomly assigned to 7 groups as their ages (1 year old to 7 year old). In all group ewes were exposed to hormone therapy for 3 lambing periods by 8 months intervals. Hormone therapy comprised that all ewes were inserted progesterone sponges for 12 to 14 days before their own mating dates and administrated with 400 IU PMSG at sponge removal. All ewes were mated with rams naturally. There were significant differences among age groups as parturition mean, lambing rate, litter size, weaning rate, lamb born crop and lamb weaned crop (P<0.01), while the bareness of ewes and lamb mortality rate before weaning, were statistically equal in all groups. The results revealed that 5 year old and 6 year old ewes had the highest response to hormone therapy under a 3 times lambing in two years schedule and have a highest lamb production, whereas 1 year old and 7 year old ewes had a lowest performance.
1- امامی میبدی، م.ع. ترکمن زهی، ا. امام جمعه کاشان، ن. رحیمی، ش. قره داغی، ع.ا. واعظ ترشیزی، ر(1378): بررسی رابطه وزن میش در زمان آمیزش با بازده تولید مثل در گوسفند نژاد بلوچی در شرایط پرورش سنتی. مجله علوم کشاورزی ایران، شماره30: صفحه 684-673.
2-Al-Nokhaif, A.A., (2009): Growth performance of Thamari sheep in Yemen. Thesis Submitted to the School of Graduate Studies .University Putra Malaysia: in fulfillment of the Requirement for the Degree of Doctor of Philosophy. Pages: 197.
3-Benyi, K., Norris, D., Karbo, N., Kgomo, K.A., (2006): Effects of genetic and environmental factors on pre-weaning and post-weaning growth in West African crossbred sheep. Tropical Animal Health and Production .38:547–554.
4-Berhanu, B., Aynalem, H., (2009): Reproductive performance of traditionally managed sheep in the south western part of Ethiopia. Livestock Research for Rural Development 21 (12), article: 154.
5- Brown, M. A., Jackson, W. G., (1995): Ewe productivity and subsequent pre-weaning lamb performance in St. Croix sheep bred at different times during the year. Journal of Animal Science .73:1258-1263.
6- Croker, K., Hart, K., Davidson, R., (2005): The potential lambing performances of ewes in mixed age flocks. The lambmax experience .Ovine Observer .no31.
7- David, J. M., Astruc, G., Lagriffoul, E., Manfredi, C., Granié, R., Bodin, L., (2008): Genetic Correlation between Female Fertility and Milk Yield in Lacaune Sheep. Journal of Dairy Science. 91: 4047– 4052.
8- Dwyer, C. M., Lawrence, A.B., (1999): Maternal behavior in domestic sheep: interactions with genotype, environment and maternal physiology. Animal and Food Science .Research Report 1999 .Edinburgh, Scotland. Pp: 8-13.
9- Freetly, H. C., Nienaber, J. A., Leymaster, K. A., Jenkins, T. G., (1995): Relationships among heat production, body weight, and age in Suffolk and Texel ewes. Journal of Animal Science .73:1030-1037.
10- Gaskins, C. T., Snowder, G. D., Westman, M. K., Evans, M., (2005): Influence of body weight, age, and weight gain on fertility and prolificacy in four breeds of ewe lambs. Journal of Animal Science. 83:1680-1689.
11- Koycegiz, F., Emsen, E., Diaz, A. G., Kutluca, M., (2009): Effects of ewe lambing season, lamb breed and ewe parity on production traits of fat tailed sheep and their lamb. Journal of Animal and Veterinary Advances .8:195-198.
12- Koyuncu, M., (2005): Reproductive performance of Kivirik ewes on accelerated lambing management. Pakistan. Journal of Biology Science .8:1499-1502.
13- Kridli, R.T., Hussein, M. Q., Muhdi, H. A., Khazeleh, J. M., (2006) .Reproduction performance of hormonally treated anestrous Awassi ewes. Journal of Animal reproduction .3:347-352.
14- Kushwaha, B. P., Ravindra Kumar, A. L., Sushil Kumar, A., (2007): Reproductive performance of native and crossbred ewes under semi arid climate. Indian Journal of small ruminant research. 13: 165-171.
15- Lewis, R. M., Notter, D. R., Hogue, D. E., Magee, B.H., (1996): Ewe Fertility in the STAR Accelerated Lambing System1. Journal of Animal Science .74:1511-1522.
16- Macedo, R., Hummel, J. D., (2006): Influence of parity on productive performance of Pelibuey ewes under intensive management in the Mexican dry tropics. Livestock Research for Rural Development .18(6).
17- Pala, A., (2001): Effects of three twice-a-year breeding schedules in four breeds of sheep. A dissertation submitted to the Graduate Faculty of North Carolina State University in partial fulfillment of the requirements for the Degree of Doctor of Philosophy. North Carolina State University .Pages: 107.
18- Qureshi, M.A., (2007): Performance of Kajli sheep in Pakistan. B. Fertility and lambing production as influenced by environment. Pakistan Journal of Agricultural Research .20: 3-4.
19- Senou, M., Youssao, A. K. I., Tobada, P., Gnangboche, S. A. B., Aboki, V., Alimy, S., Tondji, P. M., (2009): Analysis of reproductive performance of Djallonké ewes in Benin. Livestock Research for Rural Development .21 (12), article: 210.
20- Warwick, B. L., Cartwright, T. C., (1958): Adjustment of milk lamb weaning weights to a standard age .Journal of Animal Science. 17:521-526.
21- Wildeus, S., (1999): Current concepts in synchronization of estrus: sheep and goats .Journal of animal science. 77:1-14.
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