Influence of Nutrition on Seasonal Variations in Testicular Morphology and Function in Corriedale Rams

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概要

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• To test the hypothesis that seasonal variations in testicular morphology and function differ in Corriedale rams subject to different feeding levels, 24 spring-born Corriedale rams, aged 14-15 months at the beginning of the trial and raised under extensive grazing conditions in Uruguay, were allotted at random to two groups: Group H, that grazed on improved (sown) pastures, and Group L, the control, that grazed on natural pastures (range). Clinical data (live weight, scrotal circumference), semen, blood and tissue samples (testis, epididymis and seminal vesicle) were collected during each of four seasons (for one month/season) of the year. According to data measured, testicular form and function had its peak in autumn followed by a decline in winter and a subsequent recovery in spring and summer. Live weight loss during winter was significantly decreased in Group L but not in Group H. Scrotal circumference, seminiferous tubules diameter and seminal vesicle epithelial height decreased significantly during winter in both groups. Group H scrotal circumference returned earlier (spring) than Group L (summer) to autumn values. By summer, seminiferous tubules and seminal vesicle epithelial height had returned to autumn values in Group H, but not in Group L. Decrements of scrotal circumference in winter and spring were milder in Group H than in Group L animals. Group H testosterone values in autumn were higher than those from Group L in spring. In summary: 1) differences existed in seasonal variations in testicular morphology and function between Corriedale rams subjected to different feeding levels and, 2) the findings suggest that nutritional factors contributed, at least partly, to the differences in variations observed throughout the experiment.

• 日本繁殖生物学会の論文
• 1997-05-01

著者

• Gastel Teresa

  Department Of Histology & Embryology Faculty Of Veterinary Medicine Swedish University Of Agricu

• Castrillejo Alejandro

  Department Of Obstetrics And Gynaecology Faculty Of Veterinary Medicine Swedish University Of Agricu

• Rodriguez-martinez Heriberto

  Department Of Obstetrics And Gynaecology Faculty Of Veterinary Medicine Swedish University Of Agricu

• Rodriguez-martinez Heriberto

  Department Of Obstetrics And Gynaecology Centre For Reproductive Biology Swedish University Of Agric

• Lundeheim Nils

  Department Of Animal Breeding & Genetics Faculty Of Agriculture Swedish University Of Agricultur

• BIELLI Alejandro

  Department of Anatomy & Histology, Faculty of Veterinary Medicine, Swedish University of Agricultura

• PEREZ Raquel

  Department of Animal Anatomy & Physiology, Faculty of Agriculture, Swedish University of Agricultura

• LOPEZ Alvaro

  Department of Animal Anatomy & Physiology, Faculty of Agriculture, Swedish University of Agricultura

• REGUEIRO Mariel

  Department of Animal Anatomy & Physiology, Faculty of Agriculture, Swedish University of Agricultura

• FORSBERG Mats

  Department of Clinical Chemistry, Faculty of Veterinary Medicine, Swedish University of Agricultural

• Perez Raquel

  Department Of Animal Anatomy & Physiology Faculty Of Agriculture Swedish University Of Agricultu

• Lopez Alvaro

  Department Of Animal Anatomy & Physiology Faculty Of Agriculture Swedish University Of Agricultu

• Forsberg Mats

  Department Of Clinical Chemistry Faculty Of Veterinary Medicine Swedish University Of Agricultural S

• Regueiro Mariel

  Department Of Animal Anatomy & Physiology Faculty Of Agriculture Swedish University Of Agricultu

• Bielli Alejandro

  Department Of Anatomy & Histology Faculty Of Veterinary Medicine Swedish University Of Agricultu

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• In Vitro Assessment of Viability and Fertilizing Capacity of Bull Spermatozoa
• Influence of Nutrition on Seasonal Variations in Testicular Morphology and Function in Corriedale Rams
• Morphological Features of the Seminiferous and Cauda Epididymides Epithelia of Breeding Zebu Bulls with Normal and Decreased Testicular Consistency
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