Correlated responses in reproductive fitness to selection in chickens
نویسندگان
چکیده
منابع مشابه
Correlated responses in reproductive and carcass traits to selection for 70-day weight in Landrace swine.
Correlated responses in reproductive and carcass traits were studied in 181 litters and 218 pigs from a line of Landrace pigs selected six generations for increased weight at 70 d of age and a contemporaneous, randomly selected control line. The reproductive and maternal traits studied included litter sizes born, born alive, and alive at 21 d and litter weight at birth and at 21 d. Carcass trai...
متن کاملCorrelated responses in reproductive and carcass traits to selection for 200-day weight in Duroc swine.
Correlated responses in reproductive and carcass traits from a line of Duroc pigs selected for increased 200-d weight along with a randomly selected control line were studied in 189 litters (116 select, 73 control) and 191 pigs (106 select, 85 control), respectively. Reproductive and maternal traits studied included litter sizes born, born alive, and alive at 21 d and litter weight at birth and...
متن کاملCorrelated responses in reproductive and carcass traits to selection for 200-day weight in Landrace pigs.
Correlated responses in reproductive and carcass traits from a line of Landrace pigs selected for increased 200-d weight along with a randomly selected control line were studied in 195 litters (109 select, 86 control) and 285 pigs (132 select, 153 control). Reproductive and maternal traits studied included litter sizes born, born alive, and alive at 21 d and litter weights at birth and at 21 d....
متن کاملCorrelated responses of carcass and reproductive traits to selection for rate of lean growth in swine.
Mass selection for an index of increased postweaning average daily gain and decreased backfat thickness was practiced for five generations. Litter size and weight for 221 gilt litters, birth weight and nipple number for 2,242 piglets and weaning weight at 42 d of age for 2,111 pigs were recorded. Carcass measurements were taken on 331 pigs. Differences between means of the lines (select control...
متن کاملDirect and Correlated Responses to Selection
Hemolymph juvenile hormone esterase (JHE) activity on the third day of the last stadium in the cricket, Gryllus assirnilis, exhibited a significant response to selection in each of six replicate lines. Mean realized heritability was 0.26 t 0.04. The response was due to changes in whole-organism enzyme activity as well as to changes in the proportion of enzyme allocated to the hemolymph compartm...
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ژورنال
عنوان ژورنال: Genetical Research
سال: 1968
ISSN: 0016-6723,1469-5073
DOI: 10.1017/s0016672300011435