Seasonal changes in semen characteristics, hormonal profiles and testicular activity in Zaraibi goats

被引:36
作者
Barkawi, A. H.
Elsayed, Eitedal H.
Ashour, G.
Shehata, E.
机构
[1] Cairo Univ, Dept Anim Prod, Fac Agr, Giza, Egypt
[2] Minist Agr, Anim Prod Inst, Giza, Egypt
关键词
Zaraibi goat; semen characteristics; testosterone; FSH; LH; testicular histological structure; TESTIS DIAMETER; SIZE; RAMS;
D O I
10.1016/j.smallrumres.2005.09.007
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
090502 [动物营养与饲料科学];
摘要
Ten Zaraibi buck goats were used to study the effect of season on semen quality. Bucks were housed and fed according to standard recognized practices. Semen was collected twice a week for 7 consecutive weeks (starting from the 3rd to the 9th week) in the mid of the each season. During these periods scrotal circumference was measured fortnightly. The number of mounts terminating in ejaculation and the time interval between the first mount and ejaculation were also recorded. The physical parameters of semen and semen index (semen volume x spermatozoa concentration/ml x live spermatozoa% x progressive motility%) were measured for the first and the second ejaculates of each semen collection during the week. At the end of each season, testicular biopsies were obtained surgically from three bucks for histological evaluation. Plasma testosterone, FSH and LH concentrations were also determined twice weekly. Bucks demonstrated the highest libido in summer, using the least (P < 0.01)number of mounts and a shorter (P < 0.01) reaction time. This coincided with a higher (P < 0.01) level of plasma testosterone (10ng/ml) and the best semen quality (semen index: 3354 x 10(6)). During autumn, bucks recorded the highest (P < 0.0 1) ejaculate volume (0.98 tul) and the maximum output of sperm (4565 x 10(6)), as well as a lower (P < 0.01) percentage of sperm abnormalities (8.8%). This was accompanied by high concentrations of plasma LH (average 2.9 mIU/ml). The histological structure of the testis indicated that during autumn (natural breeding season) seminiferous tubules (Sta) occupied the majority of the testicular tissues (76.6%) and the spermatic layers were highest. It can be said that Zaraibi bucks have distinct seasonal activity, with poor semen characteristics during winter and spting-which may be a critical obstacle for implementing intensive systems of three kidding in 2 years when natural mating is applied. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:209 / 213
页数:5
相关论文
共 18 条
[1]
ABOULELA MB, 1988, SMALL RUMINANTS RES, P2
[2]
SEASONAL-VARIATIONS IN TESTIS SIZE, LIBIDO AND PLASMA TESTOSTERONE CONCENTRATIONS IN BRITISH GOATS [J].
AHMAD, N ;
NOAKES, DE .
ANIMAL SCIENCE, 1995, 61 :553-559
[3]
CANEDO G, 1996, P 6 INT C GOATS BEJ, V2
[4]
SEXUAL-BEHAVIOR AND GONADAL ACTIVITY DURING THE YEAR IN THE TROPICAL CREOLE MEAT GOAT .2. MALE MATING-BEHAVIOR, TESTIS DIAMETER, EJACULATE CHARACTERISTICS AND FERTILITY [J].
CHEMINEAU, P .
REPRODUCTION NUTRITION DEVELOPMENT, 1986, 26 (2A) :453-460
[5]
SEASONAL-CHANGES IN BREEDING ACTIVITY, TESTICULAR SIZE, TESTOSTERONE CONCENTRATION AND SEMINAL CHARACTERISTICS IN RAMS WITH LONG OR SHORT BREEDING-SEASON [J].
DUFOUR, JJ ;
FAHMY, MH ;
MINVIELLE, F .
JOURNAL OF ANIMAL SCIENCE, 1984, 58 (02) :416-422
[6]
Evans G., 1987, SALAMONS ARTIFICIAL, P93
[7]
SEASONAL-VARIATION IN TESTIS DIAMETER AND SPERM OUTPUT OF RAMS OF BREEDS OF DIFFERENT PROLIFICACY [J].
ISLAM, ABMM ;
LAND, RB .
ANIMAL PRODUCTION, 1977, 25 (DEC) :311-317
[8]
JUNQUEIRA LC, 1980, BASIC HISTOLOGY, P1
[9]
Characteristics and seasonal variations in the semen of Alpine, Saanen and Damascus goat bucks born and raised in Greece [J].
Karagiannidis, A ;
Varsakeli, S ;
Karatzas, G .
THERIOGENOLOGY, 2000, 53 (06) :1285-1293
[10]
Kaya A., 1999, Hayvancilik Araștirma Dergisi, V9, P1