منابع مشابه
Evaluation of seasonal variation in acne vulgaris
Background and Aim: Acne vulgaris is one of the most common skin diseases in adolescents and young adults. Although acne do not physically disable the patient, it can cause significant psychological morbidities. The disease etiology is not fully understood; however, there are several factors involved in the pathogenesis. The aim of this study is to investigate the seasonal variation of acne vul...
متن کاملSeasonal variation in semen characteristics of Chios and Friesian rams in Greece.
Five Chios and five Friesian rams were used to study the effect of season on semen production. Semen samples were collected with an artificial vagina. In spite of the large variation of most of the semen characteristics among rams of the two breeds, seasonal variation in semen quantity (volume, concentration and total number of spermatozoa per ejaculate) and quality (percentage of motile sperma...
متن کاملSeasonal Changes in the Testicular Size of Grazing Rams
Studies over 3 years showed that testicular volume falls during summer and autumn when forage quality and availability decline and when rams are mating. Loss in testicular size may also occur in summer in the absence of mating activity and at a greater rate than loss in live weight. The results suggest that mating and nutrition may override the influence of photoperiod on testicular size and th...
متن کاملseasonal changes of spermatogenic activity in khouzestan arabian rams
the reproductive activity is influenced by environmental conditions in most animal species. the aim of the present study was to determine the seasonal changes of seminiferous tubules structure and spermatogenic activity in khouzestan arabian rams. for this propose 30 adult rams were reared under closed grazing conditions. four rams were randomly selected in each season and their live weight, te...
متن کاملSeasonal Changes I N T H E Semen of Rams
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 u...
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ژورنال
عنوان ژورنال: New Zealand Journal of Experimental Agriculture
سال: 1977
ISSN: 0301-5521
DOI: 10.1080/03015521.1977.10425949