ESTIMATES OF GENETIC-PARAMETERS IN TURKEYS .3. SEXUAL DIMORPHISM AND ITS IMPLICATIONS IN SELECTION PROCEDURES

被引:15
作者
TOELLE, VD [1 ]
HAVENSTEIN, GB [1 ]
NESTOR, KE [1 ]
BACON, WL [1 ]
机构
[1] OHIO STATE UNIV,OHIO AGR RES & DEV CTR,DEPT POULTRY SCI,WOOSTER,OH 44691
关键词
D O I
10.3382/ps.0691634
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Live, carcass, and skeletal data taken at 16 wk of age on 504 female and 584 male turkeys from 34 sires and 168 dams were utilized to evaluate sex differences in genetic parameter estimates. Data were transformed to common mean and variance to evaluate possible scaling effects. Genetic parameters were estimated from transformed and untransformed data. Further analyses were conducted with a model that included sire by sex and dams within sire by sex interactions, and the variance estimates were used to calculate genetic correlations between the sexes and genetic regression parameters. Heritability estimates from transformed and untransformed data were similar, indicating that sex differences were present in the genetic parameters, but scaling effects were not an important factor. Genetic correlation estimates from paternal (PHS) and maternal (MHS) half-sib estimates were close to unity for BW (1.14, PHS; 1.09, MHS), shank width (.99, PHS; .93, MHS), breast muscle weight (1.23, PHS; 1.04, MHS), and shank length (1.09, PHS; .97, MHS). However, abdominal fat (.79, PHS; .59 MHS), total drumstick muscle weight (.75, PHS; 1.14, MHS), rough cleaned shank weight (.78, PHS; not estimatable, MHS), and shank bone density (1.00, PHS; .53, MHS) estimates were somewhat lower. The estimates suggest that the measurement of these latter "traits" at the same age in the two sexes may, in fact, be measuring different genetic effects and that selection procedures in turkeys need to take these correlations into account in order to make optimum progress. The genetic regression parameters indicated that more intense selection in the sex that has the smaller genetic variation could be practiced to make greater gains in the opposite sex.
引用
收藏
页码:1634 / 1643
页数:10
相关论文
共 56 条
[1]   MATERNAL EFFECTS ON EMBRYONIC AND POST-EMBRYONIC GROWTH IN POULTRY [J].
ALMURRANI, WK .
BRITISH POULTRY SCIENCE, 1978, 19 (03) :277-281
[2]   THE INFLUENCE OF GENETIC INCREASES IN BODY-WEIGHT AND SHANK WIDTH ON THE ABDOMINAL FAT PAD AND CARCASS COMPOSITION OF TURKEYS [J].
BACON, WL ;
NESTOR, KE ;
RENNER, PA .
POULTRY SCIENCE, 1986, 65 (02) :391-397
[3]   A SEX-LINKED ENZYME IN BIRDS - Z-CHROMOSOME CONSERVATION BUT NO DOSAGE COMPENSATION [J].
BAVERSTOCK, PR ;
ADAMS, M ;
POLKINGHORNE, RW ;
GELDER, M .
NATURE, 1982, 296 (5859) :763-766
[4]  
BECKER WA, 1964, GENETICS, V50, P235
[5]   ON POSSIBILITY THAT SEX-CHROMOSOMES HAVE A GREATER EFFECT THAN AUTOSOMES ON INHERITANCE [J].
BEILHARZ, RG .
JOURNAL OF GENETICS, 1963, 58 (03) :441-&
[6]   MATERNAL AND SEX-LINKED GENETIC-EFFECTS IN BROILER PARENT STOCKS [J].
BERNON, DE ;
CHAMBERS, JR .
POULTRY SCIENCE, 1985, 64 (01) :29-38
[8]   INFLUENCE OF SEX-CHROMOSOMES ON LAYING-HOUSE PERFORMANCE OF CHICKENS [J].
BRIGGS, DM ;
NORDSKOG, AW .
BRITISH POULTRY SCIENCE, 1973, 14 (04) :403-412
[9]   SEX-DIFFERENCES IN BODY-WEIGHT OF CHICKEN EMBRYOS [J].
BURKE, WH ;
SHARP, PJ .
POULTRY SCIENCE, 1989, 68 (06) :805-810
[10]  
Cahaner A., 1986, 3rd World Congress on Genetics applied to Livestock Production, Lincoln, Nebraska, USA, July 16-22, 1986. X. Breeding programs for swine, poultry, and fish., P337