PRODUCTION PERFORMANCE OF PROLIFIC JAVA']JAVANESE EWES

被引：12

作者：

INOUNU, I ^{[1
]}

INIGUEZ, L ^{[1
]}

BRADFORD, GE ^{[1
]}

SUBANDRIYO ^{[1
]}

TIESNAMURTI, B ^{[1
]}

机构：

[1] UNIV CALIF DAVIS,DEPT ANIM SCI,DAVIS,CA 95616

来源：

SMALL RUMINANT RESEARCH | 1993年 / 12卷 / 03期

关键词：

PROLIFIC SHEEP; EWE PRODUCTION; REPEATABILITY; HERITABILITY; MAJOR GENE;

D O I：

10.1016/0921-4488(93)90061-L

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Production performance of Javanese ewes (483 ewes with 1263 records) in West Java, Indonesia, was evaluated. The focus was on the effect of prolificacy and environmental sources of variation on lamb survival (S) as a ewe trait and on lambing and weaning outputs. Non-carriers (FecJ(+)FecJ(+)), carriers (FecJ(+)FecJ(+)) and homozygotes (FecJ(+)FecJ(+)) for a gene affecting prolificacy, averaged 1.24, 1.95 and 2.59 lambs born, respectively. Prolificacy-year (PY) effects were significant, with FecJ(F)FecJ(F) animals being more sensitive to fluctuations. Repeatability for litter size was 0.51 and heritability 0.62. PY, gestation ewe weight gain (EGG) and parity significantly affected S. Singles, twins, triplets and quadruplets averaged 87, 69, 47, and 35% S, respectively, with fewer lambs surviving in these litter size categories in poor years. Repeatability of S was 0.19. Litter weaning weights (TWW) were influenced significantly by PY, parity and EGG. EGG contributed less than litter birth weight to the determination of S and TWW in all litters, although its contribution to TWW was proportionally higher than that to S. Repeatability of TWW was 0.20. Higher prolificacy led to a diminution of the ewe's body resources as indicated by EGG, therefore reducing the ewe's ability to support satisfactory birth weights of lambs and lactation, particularly under poor nutrition. With higher EGGs and survival rates under improved nutrition, a single copy of the FecJ(F) gene increased the productivity of ewes (TWW) by at least 18%; while under suboptimum nutrition, it had a negative effect. There is a need to investigate the nutritional management of animals having the FecJ(F) gene since the gene is widely distributed in most Indonesian sheep populations.

引用

页码：243 / 257

页数：15

共 21 条

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