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RISS 인기검색어
- 검색키워드
- 저자 : 이용빈 ( Jung Kye Kim (검색결과 1 건)
- 무료
- 기관 내 무료
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김중계,이용빈 ( Jung Kye Kim,Yong Bin Lee ) 한국축산학회 1975 한국축산학회지 Vol.17 No.3
This study was carried out to investigate the effects of nutritional conditions and breeds on spermatogenic function and sexual maturity of boar during growing period. Each eight heads of pure and cross breeds were respectively divided into two groups fed one for 100% of NRC (National Research Concil) nutritional requirement (standard feeding) and other for 70% of NRC nutritional requirement (limited feeding) during 14 months and investigated their growth rate, development of testis, spermatogenesis, semen quality and freezability. The results obtained are as follows; 1. The standard feeding boars showed significantly (P$lt;0.01) higher body weight han the limited one and the crossbred also showed higher body weight gain than the purebred during growing period, however there was no significant difference between pure and cross breeds. 2. Circumference of scrotum and length, and width of testis of the standard feeding boars were higher than those of the limited feeding and testicular growth rate of the crossbred was about one month earlier than that of the purebred. There was significant (P$lt;0.01) positive correlation between body weight and circumference of scrotum, length and width of testis. 3. Diameter of seminiferous tubule of pig aged at 8 months was 235μ for the standard feeding and 214μ for the limited feeding respectively. The standard feeding showed slightly higher value than the limited feeding. However, there was no significant difference between the two levels. There was no difference in diameter of seminiferous tubules between pure and cross breeds. 4. In case of the standard feeding, spermatogonia were appeared in the seminiferous tubules at 2 months of age, spermatocytes at 3 months, and spermatozoa at 5 months. However, in case of the limited feeding one among four heads showed spermatogonia in seminiferous tubules at 3 months of age, and one among four showed spermatozoa at 5 months of age. Appearance of sperm cells in seminiferous tubules of the limited feeding was one month later than that of the standard feeding. 5. In case of the standard feeding, the crossbred reached at puberty (75㎏) on 170 days after birth and the purebred on 215 days. However in case of the limited feeding the crossbred on 209 days and the purebred on 262 days respectively. The standard feeding boars reached at puberty on average 197 days after birth, but the limited feeding boars reached on average 236 days. The boar on standard feeding reached at puberty 39 days earlier than the boar on limited feeding. The boar on standard feeding showed the mounting desire on dummy earlier than the boars on limited feeding, and the crossbred also showed more strong desire to mount dummy than the purebred. 6. The boar on standard feeding showed highly significant in total volume of semen (p$lt;0.01) and in total number of spermatozoa than the boar on limited feeding, and the crossbred showed slightly higher total volume of semen and total number of spermatozoa than the purebred but there were no significant differences between cross and pure breeds. The percentages cf droplet spermatozoa and abnormal spermatozoa showed no difference between two nutritional levels and two breeds, respectively. The droplet spermatozoa in initial ejaculation was 45%, however that in ejaculation from 14 months aged boar was 5-9.9%. 7. Semen volume, total number of spermatozoa, percentage of droplet spermatozoa and abnormal spermatozoa of the boar on standard feeding during 14 months were 293.4㎖. 466.4×10^8, 5.67% and 6.72% respectively, and those of the limited feeding were 206.7㎖, 467×10^8, 7.2% and 7.2% respectively. The volume of semen has positive correlation with number of spermatozoa, content of gelatin, number of normal spermatozoa, number of live sperm and ejaculation time. However number of droplet spermatozoa has negative correlation with number of abnormal spermatozoa. 8. There were no differences in pH, specific gravity and reflection r
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