The effect of age at first mating on litter characteristics in the native nigerian pig

Livestock Production Science - Tập 8 - Trang 155-159 - 1981
Obi Chiboka1
1Department of Animal Science, University of Ife, Ile-Ife Nigeria

Tài liệu tham khảo

Brooks, 1973, Meat production from pigs which have farrowed. 1. Reproductive performance and food conversion efficiency, Anim. Prod., 17, 305, 10.1017/S0003356100017104 Chiboka, 1979, Effect of age at breeding on reproduction in local sheep, Ife J. Agric., 1, 183 Hughes, 1975, Reproduction in the gilt. 1. The influence of age and weight at puberty on ovulation rate and embryo survival in the gilt, Anim. Prod., 21, 183, 10.1017/S0003356100030609 Omtvedt, 1965, Relationship of gestation length, age and weight at breeding, and gestation gain to sow productivity at farrowing, J. Anim. Sci., 24, 531, 10.2527/jas1965.242531x Pay, 1973, Growth, food consumption and litter production of female pigs mated at puberty and at low body weight, J. Anim. Sci., 47, 780 Perry, 1956, Observations on reproduction in a pedigree heard of Large White Pigs, J. Agric. Sci., 47, 332, 10.1017/S0021859600040375 Plocek, 1967, The effect of the age of the sow at first mating on her performance, Ved. Pr. Vyzk. Ust. Chov. Prasat Kosteki Nad Orlici, 2, 11 Revelle, 1973, An explanation for the low heritability of litter size in swine, J. Anim. Sci., 37, 668, 10.2527/jas1973.373668x Snedecor, 1967 Steel, 1960 Vlcek, 1942, Influence of the age of first service on the length of pregnancy of sows, Zverolek Rozpr., 16, 4 Zimmerman, 1975, Selection for ovulation rate in swine: population procedures and ovulation response, J. Anim. Sci., 40, 61, 10.2527/jas1975.40161x