EFFECTS OF THE DAM ON EQUINE CHORIONIC-GONADOTROPIN CONCENTRATIONS DURING PREGNANCY

被引:9
作者
MARTINUK, SD [1 ]
BRISTOL, F [1 ]
MURPHY, BD [1 ]
机构
[1] UNIV SASKATCHEWAN, DEPT HERD MED & THERIOGENOL, SASKATOON S7N 0W0, SASKATCHEWAN, CANADA
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/0739-7240(90)90012-O
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Breeding trials were designed to determine the influence of the mare on serum concentrations of equine chorionic gonadotropin (eCG) from Day 39 to Day 104 of gestation. Sires were ranked according to mean eCG concentrations found in the groups of randomly selected mares to which they were mated in 1983. Mares were ranked according to their mean eCG concentrations on Days 55, 71 and 85 of gestation (Day 0 = mating), in 1983 and 1985. In the 1986 breeding season, mares that had pregnancies characterized by high eCG levels were mated to sires previously associated with low eCG concentration pregnancies and low producing mares were mated to sires associated with high eCG concentration pregnancies. The highest eCG concentrations (12.8 ug/ml serum) were detected on Day 55 of gestation in mares mated to the low-ranked sire (P<0.01), indicating an influence of the mare on serum eCG concentration. A comparison of eCG production by individual mares in 1985, 1986 and 1987 showed that mares retained the same rank (P<0.001), regardless of the rank of the sire to which they were mated. It was concluded that the influence of the mare predominates in determining eCG concentration. In 1987, the highest ranked sire was mated to the highest eCG producing mares (ranked 1-20) and the second highest ranked sire was mated to mares ranked 21-40. Two distinct subgroups resulted, suggesting that the selection of sires and mares could be used to maximize the production of eCG. © 1990.
引用
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页码:551 / 557
页数:7
相关论文
共 14 条
[1]   IMMUNOLOGICAL MEASUREMENT OF PREGNANT MARE SERUM GONADOTROPHIN [J].
ALLEN, WR .
JOURNAL OF ENDOCRINOLOGY, 1969, 43 (04) :593-+
[2]  
ALLEN WR, 1982, J REPROD FERTIL, P57
[3]  
ALLEN WR, 1972, J REPROD FERTIL, V29, P313, DOI 10.1530/jrf.0.0290313
[4]  
BELL RJ, 1985, THESIS U SASKATCHEWA
[5]   INFLUENCE OF FOETAL GENOTYPE ON EQUINE GONADOTROPHIN SECRETION [J].
CLEGG, MT ;
HOWARD, CB ;
COLE, HH ;
PIGON, H .
JOURNAL OF ENDOCRINOLOGY, 1962, 25 (02) :245-&
[6]   The potency of blood serum of mares in progressive stages of pregnancy in effecting the sexual maturity of the immature rat [J].
Cole, HH ;
Hart, GH .
AMERICAN JOURNAL OF PHYSIOLOGY, 1930, 93 (01) :57-68
[7]  
DAY FT, 1948, J ENDOCRINOL, V5, P1
[8]   IMMUNOCHEMICAL STUDIES WITH PREGNANT MARE SERUM GONADOTROPIN [J].
FARMER, SW ;
PAPKOFF, H .
BIOLOGY OF REPRODUCTION, 1979, 21 (02) :425-431
[9]   FIXATION AND ORIENTATION OF THE EARLY EQUINE CONCEPTUS [J].
GINTHER, OJ .
THERIOGENOLOGY, 1983, 19 (04) :613-623
[10]  
MANNING AW, 1985, J REPROD FERT S, V35, P389