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bp0009rdr16 | (1) | REDR1986

Short light cycles induce persistent reproductive activity in Ile-de-France rams

Summary. European breeds of rams appear to be responsive to photoperiodic changes even though there are large differences between breeds in the timing and amplitude of endocrine (LH and testosterone) and gametogenetic variations before the sexual season. Light regimens such as 6-month light cycles or alternations of constant short and long days every 12–16 weeks are able to entrain the parameters of sexual activity. In these regimens in which the period ...

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bp0013cpr19 | Early Pregnancy | CPR1989

Embryonic and uterine development during early pregnancy in pigs

Stroband T. Van der Lende , Van der Lende T. ,

Summary. Comparison of the timing of pig preimplantation development, alterations’ in the ultrastructure of embryonic germ layers, and cytological changes of the uterine epithelial cells leads to the supposition that a close relationship exists between embryonic and uterine development during early pregnancy. The results of in-vitro studies of embryonic development and of experiments concerning asynchrony between embryos and uterine environment conf...

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bp0010ised4 | (1) | ISED2019

Embryonic diapause in the European roe deer (Capreolus capreolus)

van der Weijden VA , Ulbrich SE

Keywords: Embryonic diapause, European roe deer, embryo-maternal communication© Third International Symposium on Embryonic Diapause...

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bp0011cpr18 | IV Parturition | CPR1982

Physiology and Endocrinology of The Foetus in Late Gestation

Macdonald A.A. , Colenbrande B. , Van Vorstenbosch C.J.A.H.V.

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bp0017cpr13 | (1) | CPR2005

Dietary fat and reproduction in the post partum sow

van den Brand H. , Kemp B.

Lactating sows are not able to ingest sufficient energy to produce the large amount of milk they are presently capable of. Therefore, sows use a considerable amount of body reserves to maintain their milk production. Body weight loss is negatively associated with subsequent reproductive performance. Addition of fat to the diet is often used to increase energy intake during lactation. This review examines the effects of adding fat to the diet on subsequent reproductive pe...

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bp0007rdr15 | The Lamming Memorial Lecture | REDR2010

Mechanisms and pathobiology of ovulation

Murdoch WJ , Murphy CJ , Van Kirk EA , Shen Y

The ovulatory process is extraordinary in that it constitutes a hormone- induced injury. Gonadotropin delivered via the follicular vascular wreath stimulates secretion of plasminogen activator by contiguous ovarian surface epithelial cells. A consequent elevation in interstitial plasmin activates collagenases and cleaves tumor necrosis factor α from its anchors on endothelium. Collagen fibril degradation and cellular death at the apex of the preovulatory follicle are hall...

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bp0016cpr18 | Gestation and Parturition | CPR2001

Prenatal development as a predisposing factor for perinatal losses in pigs

van der Lende T. , Knol E. F. , Leenhouwers J. I.

The pig industry is confronted with substantial losses due to piglet mortality. With 3-8% stillbirths and generally > 10% preweaning mortality, approximately one fifth of al I fetuses formed fully at the end of gestation die before weaning. Most of these losses occur in the perinatal period. Overall prenatal development (birth weight) and specific prenatal developmental and maturational processes in late gestation are predisposing factors for perinatal losses. Birth weight ...

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bp0018cpr20 | Management of Ovarian Activity in Swine | CPR2009