Seasonal Changes I N T H E Semen of Rams
نویسنده
چکیده
E ACH year in the central valley of California, about 10% of the breeding ewes fail to lamb. In certain years the percentage of "dry ewes" in individual flocks may be higher. Available information indicates that the problem may be environmental in nature, because a high percentage of the nonlambing ewes produce lambs in subsequent years. Because ram fertility may influence breeding efficiency under these conditions, semen was collected over the entire year to determine the seasonal changes in quality occurring under these environmental conditions.
منابع مشابه
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