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The aim of this study was to improve reproduction efficiency and increase the fecundity index by reducing the interval between lambings and ultimately increasing the profitability and income of Gavdasht National Research Station. One hundered and twnty Zel ewes were randomly divided into two groups, control and treatment, 60 in each, and entered the mating program within two years. The control group was able to mate only in the reproductive season (autumn of each year) which was according to the usual method, but the treatment group was allowed to mate in addition to autumn every year in spring. The nutritional and reproductive management program was the same for both groups. The only difference was the use of progesterone sponge and PMSG hormone during spring mating for the treatment group. After lambing, information such as postpartum ewe weight, lambing status in terms of distosia, stillbirth and multiplication, lamb birth weight, lamb sex, and birth type (single or multiple) were recorded. Lamb weaning weight and mortality until weaning were also recorded. After data analysis, the results showed that the treatment group had a better performance in terms of conception rate, lambing perccentage, fecundity and weaning percentage compared to the control group (p <0.05). Also, the net income of the treatment group during two years was higher compared to the control group (857480, respectively, compared to 655746 thousand Rials). According to the results, it has been found that the administration of the reproductive management method of lambing three times in two years, with using the reproductive aid tools, can increase the lambing in a specified period of time and, as a result, make herd management easier for the farmer, reduce additional costs, allows the product to be marketed when demand for meat is high, and ultimately generate income for the farmer.
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