A Abdel-Moneim, Kh. Mazher
2010 Journal of Animal and Poultry Production  
Skin samples of five body regions (parietal, shoulder, mid-side, coxal tuber and perianal ) were collected from nine male Baladi goats aged 16 months. The influences of body region and age of castration (early 2-week versus late 6-month of age ) on odor glands, hair follicles and epidermis were examined and tested. Skin from parietal region of kids exhibited significantly (P<0.05) the highest density of follicles ( 55.8 / mm 2 ), among the other body regions. Whereas, parietal (1.7) and
more » ... l (1.7) and shoulder (1.5) regions were lower in S/P ratio than mid-side, coxal tuber (2.5 for each) and perianal ( 3, P<0.05 ) regions. Body region had a highly significant (P < 0.01) effect on density of sweat glands and sebaceous glands. The highest density of sweat glands was found in parietal region (14.8 / mm 2 ). Though the density of sebaceous glands in parietal region (26.0 / mm 2 ) ranked the second after perianal region (36.6 / mm 2 ), their size was larger in parietal region than in other body regions. Two-week castrated kids had significantly (P <0.05) less density of sweat glands than entire kids. However, the difference between entire kids and 6month castrates in sweat glands density was insignificant (P>0.05). As well, 2-week castrated kids had the lowest density of sebaceous glands compared with entire kids and 6month castrated ones. Histologically, the parietal glands of entire kids appeared highly modified and larger occupying the major part of the dermis with marked secretory activity than other regions as well as castrated kids. Sweat and sebaceous glands in parietal region of Baladi bucks are the major source of buck odor. Furthermore, the attained results revealed that castration of kids at an early age of life (2-weeks of age) plays an important role in reducing male odor. The main aim of this research was to study the effect of age at castration (early versus late) on odor glands and skin characteristics in male Baladi goats. MATERIALS AND METHODS A. Animals and management: Nine male Baladi kids born in the goat farm of Faculty of Agriculture, Cairo University, Egypt were used in the present study. Kids were randomly classified into three equal groups i.e. 1) entire kids, 2) kids castrated at 2 weeks of age and 3) kids castrated at 6 months of age. Castration was practiced using a silk string tied strongly around the neck of the testes at their connection point with spermatic cords. About 15-20 days later, the scrotum, including testes, dropped off. During the suckling period (12 weeks), kids with their dams were kept in a semi-opened pen with a yard. Beside suckling, kids were crept-fed, starting from the fifty week of age, on a ground grain mixture at an average rate of 100 g/head daily to encourage high growth. The grain mixture consisted of 35% yellow corn, 35% barley and 30% soybean meal. After weaning, kids were fed ad libitum on Egyptian clover (Trifolium alexandrinum) in winter and sorghum (Sorghum bicolor) or clover hay in the rest of the year according to their availability. At weaning time, each kid was supplemented daily with 200 g of the ground grain mixture, increased gradually to reach 400 g by sixth month of age. Afterwards, a daily allowance of 500 g pellet concentrate mixture plus 250 g barley was given to each kid till the end of experiment. The pellet mixture consisted of 42% cotton seed meal, 25% wheat bran, 22% yellow corn, 5% rice bran, 3% molasses, 2% limestone and 1% common salt. Kids had free access to water. B. Skin sampling and light microscopic examination: Entire and castrated kids had physical contact with does in estrus prior to slaughter for 14 days. Kids under the study were slaughtered at 16 months of age. Five areas of skin (parietal, shoulder, mid-side, coxal tuber and perianal), each of 1x1cm, were marked immediately before slaughtering as shown in Fig. 1 Fig 1: Body regions on the right side of goats from which skin samples Were taken: H, parietal (horn) region; S, shoulder; M, mid-side; C, region of coxal tuber and P, perianal region.
doi:10.21608/jappmu.2010.86232 fatcat:uw64t3qfjrf3heonrwbwmcvj3y