A Study of Fertility in Poultry

The Duration of Fertility of Males of Two Inbred Lines When Mated to Females of Each of the Inbred Lines

“…The data reported in this paper were collected and analyzed in order to détermine if différences in duration of fertility could be observed among inbred lines of poultry. Curtis and Lambert (1929) observed that the mean duration of fertility of females, as obtained after pen matings were discontinued, was 10.7 + 0.4 days. The extrême duration of fertility in this study was 21 days.…”

Competitive Fertilization in the Fowl

“…The techniques employed in previous studies of competitive fertilization involved either the combining of equal volumes of semen collected from males of different breeds of chickens (Bonnier and Trulsson, 1939;Parker et al 1942;Bohren et al 1945;Ferrand and Bohren, 1948) or using the method of alternation of males of different breeds of chickens (Dunn, 1927;Curtis and Lambert, 1929;Warren and Kilpatrick, 1929).…”

Estudo comparativo de duas linhagens de aves especializadas para produção de "broilers". I - Fertilidade e eclodibilidade relacionadas ao peso dos ovos

“…N o que tange à fertilidade, a heterose determina uma exacer bação do índice da mesma, ao se tomar como ponto de referência a raça de menor fertilidade envolvida no acasalamento (1, 8, 46 e 66). P or outro lado, a idade dos reprodutores parece desempenhar também destacado papel no processo de eclosão dos ovos (4,5,9,14,21,24,26,30, 36 e 62), assim como os fatores ligados à nu trição (12, 19, 32, 34, 38, 40, 41 c 50).…”