Graduate Thesis Or Dissertation
 

Vitamin E effects on sterility of White Leghorn males following prolonged vitamin E deficiency

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  • One group of four adult White Leghorn male chickens was fed a diet containing 7.3% linoleic acid and 32.4 mg/ kg of added vitamin E (group IV) for 50 weeks which was designated as the positive control. A second lot (group I) containing 14 males received the same level of linoleic acid but no added vitamin E until the 34th week when four males (group III) having the lowest fertility based on the results of the 29th week were transferred to the vitamin E supplemented diet. At 44 weeks, based on determinations made at the 38th week, the deficient group was again divided into two groups of five males each, one retained on the deficient diet (group I) which served as the negative control, the other (group II) was placed on the vitamin E supplemented diet. On the basis of first setting data (2nd-9th day after insemination) fertility of group I, the negative control, decreased to 35.0% at 29 weeks. Fertility of group IV, supplemented throughout the trial with 32.4 mg/kg of vitamin E, was significantly higher than group I beginning at 24 weeks and throughout the remainder of the experiment. At 50 weeks, fertility of the negative control group had decreased to 4.2%. Fertility of group III, (3. 3 %), supplemented with 32.4 mg/kg vitamin E at 34 weeks, and group II, (16.2%), supplemented with the above level of vitamin E at 44 weeks, had increased to 60.6% and 65.4%, respectively, at 50 weeks. At 47 weeks fertility in all supplemented groups was significantly greater than the negative control. No meaningful differences were evident between any group for semen volume, semen concentration, hatchability of fertile eggs, feed consumption or body weights. Second setting data (10th through 17th day) for fertility and hatchability of fertile eggs gave results similar to the first setting, although lower fertility values were obtained due to the decreased fertility of sperm after nine days in the oviduct. Insemination of larger volumes of semen from vitamin E deficient birds did not increase fertility, nor did a reduced volume of semen from supplemented birds result in decreased fertility. No conclusive results were obtained from the analyses of fatty acids in the sperm. It was noted, however, that sperm motility decreased in vitamin E deficient males. From these findings one may conclude the following: 1. Male chickens fed diets high in linoleic acid maintained their fertilizing capacity when supplemented with 32.4 mg/kg of vitamin E. 2. Sterility in male chickens induced by a high linoleic acid and low vitamin E diet was reversible by supplementation with 32.4 mg/kg of vitamin E, even after prolonged deficiency periods of 34 and 44 weeks duration. 3. Results obtained from the second setting of eggs would indicate that one eight-day period of collection would be sufficient. 4. Increased volume of semen from deficient birds did not increase fertility, nor did reduced volume of semen from supplemented males reduce fertility. 5. Sperm motility was decreased in vitamin E deficient birds.
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file details FriedrichsenJanetValerie1978.pdf 2017-08-17 Pubblico Scaricare