Conceptus Development in Intact and Unilaterally Hysterectomized-Ovariectomized Gilts: Interrelations among Hormonal Status, Placental Development, Fetal Fluids and Fetal Growth

Knight, James; Bazer, Fuller W.; Thatcher, W.W.; Franke, D. E.; Wallace, H. D.

doi:10.2527/jas1977.444620x

Cited by 317 publications

(217 citation statements)

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“…However, the regression of ADG on the (Table 4). These observations are in agreement with those of Waldorf et al (1957), Pomeroy (1960) and Knight et al (1977) For personal use only.…”

Section: Animalssupporting

confidence: 82%

Effect of Level of Feeding on Breeding Performance and Conceptus Development at 60 Days of Pregnancy in the Gilt

Dyck¹,

Strain²

1979

Can. J. Anim. Sci.

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“…However, the regression of ADG on the (Table 4). These observations are in agreement with those of Waldorf et al (1957), Pomeroy (1960) and Knight et al (1977) For personal use only.…”

Section: Animalssupporting

confidence: 82%

Effect of Level of Feeding on Breeding Performance and Conceptus Development at 60 Days of Pregnancy in the Gilt

Dyck¹,

Strain²

1979

Can. J. Anim. Sci.

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“…Growth of placental membranes is complete by day 60 of gestation (termE115 days) (Knight et al, 1977). It is well established that foetal growth and metabolism are directly dependent on the nutrient supply across the placenta, and that the surface area of the placental membranes greatly influences growth and survival.…”

Section: Introductionmentioning

confidence: 99%

Growth and development of offspring following supplementation of sow diets with oil during early to mid gestation

Laws

Lean

et al. 2007

Animal

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The role of dietary fat during early pregnancy in sows has not yet been fully established. The aim of the study was to determine the consequences of altering the fatty acid profile of sow diets during the first half of gestation; oils of different fatty acid composition were chosen as energy supplements to provide diets with different fatty acid profiles. A group of 48 multiparous sows were used to evaluate the effects of supplemental feeding during the first 60 days of gestation (term ≈ 115 days). Sows were allocated (eight per treatment) to either 3 kg/day of commercial sow pellets (control; C) or an experimental diet consisting of 3 kg/day of commercial sow pellets supplemented with 10% extra energy in the form of excess pellets (E), palm oil (P), olive oil (O), sunflower oil (S) or fish oil (F). Differential effects were observed with respect to the fatty acid profile of the diet during the first half of gestation. P sows gave birth to the largest litters. Both P and O supplementation of the maternal diet resulted in heavier piglets at birth, after correction for differences in litter size. P piglets possessed the most fat at birth and remained fatter throughout the pre-weaning period; in contrast, the offspring of O sows contained the least fat throughout life (0 to 140 days of age). The offspring of F sows exhibited improved growth performance during the neonatal period. In conclusion, altering the fatty acid profile of sow diets during the first half of gestation has long-term consequences for the growth and development of their offspring.

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“…They are in agreement with the concept of uterine capacity demonstrated through superovulation with a PMSG treatment of sows [12,33,41] or superinduction, adding embryos to recipient pregnant sows [3,4,19,42]: despite a much higher ovulation rate per uterine horn in the HHO than in the CTR group, litter size at term is not different. According to Webel and Dziuk [54], Knight et al [31] or Chen and Dziuk [9], foetal death related to uterine capacity occurs after day 25 of gestation. Legault et al [32] and Père et al [40] found that death of the supernumerary foetuses occurs partly before 35 days of gestation and continues thereafter.…”

Section: Effect Of Treatments On Reproductive Performance and Ubfmentioning

confidence: 99%

“…It is also higher in multiparous than in primiparous sows. According to Knight et al [31], the foetuses that exceed uterine capacity die after day 25 of pregnancy. Available space in the uterus [44] and competition between foetuses for some biochemical factors [4] were proposed as mechanisms involved in the uterine capacity.…”

Section: Introductionmentioning

confidence: 99%

Uterine blood flow in sows: effects of pregnancy stage and litter size

Père

Etienne

2000

Reprod. Nutr. Dev.

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-Female pigs were assigned to three groups at 94 days of age: a control group (CTR), a group undergoing the ligation and severing of the left oviduct (LIG), and a group undergoing right hysteroovariectomy (HHO). They were inseminated at 307 days of age. At 35 days of pregnancy, an ultrasonic transit time flow probe was implanted around the middle artery of one uterine horn in 33 sows and uterine blood flow was measured during thirteen 24-h periods between 44 and 111 days. Despite large differences in ovulation rate per uterine horn (4.8, 8.3 and 16.9 in the LIG, CTR and HHO groups, respectively), variation of litter size was considerably reduced with advancement of pregnancy (3.0, 6.6 and 10.8 foetuses per uterine horn at 35 days, and 3.0, 5.8 and 4.9 at 112 days (slaughter), respectively). Uterine blood flow increased linearly during pregnancy. It was lower in the LIG sows (0.82 to 1.74 L . min -1. horn -1 from 44 to 111 days) than in the CTR and HHO sows (1.22 to 2.84 and 1.09 to 2.63 L . min -1. horn -1 , respectively). It was more closely related to litter weight than to litter size and amounted to 0.42 L . min -1. kg foetus -1 at 111 days. Uterine blood flow per foetus decreased when litter size increased. It increased from 0.31 to 0.72, 0.26 to 0.60 and 0.20 to 0.43 L . min -1. foetus -1 from 44 to 111 days when there were 2 to 3, 4 to 5, and 6 to 8 foetuses in the uterine horn, respectively. This explains why piglets from large litters are lighter at birth.

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Conceptus Development in Intact and Unilaterally Hysterectomized-Ovariectomized Gilts: Interrelations among Hormonal Status, Placental Development, Fetal Fluids and Fetal Growth

Cited by 317 publications

References 0 publications

Effect of Level of Feeding on Breeding Performance and Conceptus Development at 60 Days of Pregnancy in the Gilt

Effect of Level of Feeding on Breeding Performance and Conceptus Development at 60 Days of Pregnancy in the Gilt

Growth and development of offspring following supplementation of sow diets with oil during early to mid gestation

Uterine blood flow in sows: effects of pregnancy stage and litter size

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