Effects of a Cold Environment and Growth Rate on Reproductive Efficiency in Gilts

Postmating Feeding Level Effects on Conception Rate and Embryonic Survival in Gilts

“…du groupe LL (87,1 ,86,2 et 87,lVa contre 64,3Vo respectivement (Dyck 1974 For personal use only. Hawton and Meade (197l).…”

The effect of the weaning to oestrus interval on litter size, live born piglets and farrowing rate in sows

“…The differences in piglet production, found at different WOI's, should be explained in an other way. Condition related differences in follicular development and LH and progesterone production affecting ovulation and embryo survival might be important factors, in which insulin and IGF-1 are suggested to play an important role (DYCK 1974;VELDHUIS et al 1986;Cox et al 1987;MATAMOROS et al 1990;PETTIGREW and TOKACH 1992). Oestrus expression or oestrus length and time of insemination in relation to the time of ovulation is another possibility affecting results of inseminations performed at different intervals (ROJKITTIKHUN et al 1992).…”

Factors Affecting The Natural Attainment of Puberty in The Gilt

“…High environmental temperatures have been reported to exert an adverse influence on several aspects of reproduction in pigs (Corteel, Signoret and Du Mesnil du Buisson, 1964;Edwards et al, 1968;Teague, Roller and Griffo, 1968;Love, 1978), with limited evidence indicating that this may also be true for puberty attainment (Schmidt and Bretschneider, 1954;Stickney et at, 1978). Conversely, Dyck (1974) has observed that the rearing of gilts under conditions of low environmental temperatures has no adverse influence on the attainment of puberty. It may be concluded that moderately low environmental temperatures will facilitate the early attainment of puberty in the gilt.…”