Hamed Kermani Moakhar; Saeed Zeinoldini; Armin Towhidi; Hamid Kohram
Volume 18, Issue 2 , June 2016, , Pages 387-395
Abstract
Using melatoninin ewes of Iran black breed, this study aimed to compare the reproduction and production performances in lambing program of two and three times per years for duration of two years. A hundred ewes allocated to two parallel groups: Group A (ewes in three lambing managing system using melatonin) ...
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Using melatoninin ewes of Iran black breed, this study aimed to compare the reproduction and production performances in lambing program of two and three times per years for duration of two years. A hundred ewes allocated to two parallel groups: Group A (ewes in three lambing managing system using melatonin) and Group B (ewes in two lambing managing system without using melatonin). To induce the estrus synchronization of ewes of Group A, 40 days before their first and second mating, melatonin implant was placed under the ear skin of these animals. Due to the decrease of birth interval in Group A, ewes of this group were dried off two weeks before mating. The nutritional flushing and ram effect were used to improve the ovulation rate in Groups of A and B, before mating. Reproduction and production parameters including estrus, ovulation, pregnancy, lambing rates and lambs weight were compared between two groups during two years. Our results indicated that the reproductive and productive performance of Group A was higher in first mating as compared to their second and third mating. The ovulation, pregnancy, lambing rate and lambs weight during two year was higher in Group A in comparison to Group B. Collectively, our findings indicated that the ewe's production and reproduction performance in three lambing managing system with the use of melatonin were more efficient compared to the ewes in two lambing managing system without using melatonin.
Hamed Kermani Moakhar; Armin Towhidi; Saeed Zeinoldini; Hamid Kohram
Volume 18, Issue 1 , April 2016, , Pages 191-200
Abstract
The aim of this study was to evaluate the effect of glycogenic diets supplemented with different poly unsaturated fatty acids on reproductive performance of Iran Black ewes in two different managing programs. Ewes were allocated in two different groups; group A (n = 75) and group B (n = 25). Ewes from ...
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The aim of this study was to evaluate the effect of glycogenic diets supplemented with different poly unsaturated fatty acids on reproductive performance of Iran Black ewes in two different managing programs. Ewes were allocated in two different groups; group A (n = 75) and group B (n = 25). Ewes from group A were stopped from suckling followed by introducing to the rams on days 80 and 90, respectively. Melatonin implant was laid under the skins ear of these ewes 40 days before introducing them to the rams. Animals from group A were divided into three groups (25 ewes/sub-group) and were fed by high starch diets supplemented with saturated fatty acids (control diet), extruded linseed (omega 3 diet), and full fat soybean (omega 6 diet). Ewes from group B were stopped from suckling on day 120, introduced to the rams on day 180 after parturition and fed as described for the control diet. Data for the rates of Estrus cycle, ovulation, lambing and twining were recorded for each group. The weight of lambs was measured at the birth time of birth, and also at 3 and 4 months of age. The lambing and twining rates were higher in omega 3 and omega 6 diets as compared with the control diet and group B. Animals in group B indicated a higher lamb weight at 3 and 4 months of age compared to all treatments in group A. In conclusion, data from current study suggested that using management program of group A along with feeding omega 3 and 6 could improve the reproductive performance of Iran Black ewes.