Searchable, peer-reviewed, open-access proceedings from bioscience and biomedical conferences

bp0013cpr8 | Semen Quality and Function | CPR1989

Factors influencingsemen quality in pigs

Colenbrander B. , Kemp B. ,

Keywords: boar; fertility; semen; season; nutrition© 1990 Journals of Reproduction & Fertility Ltd...

bp0015cpr6 | Factors Affecting Breeding Efficiency in The Pig | CPR1997

Consequences of variation in interval from insemination to ovulation on fertilization in pigs

Kemp B. , Soede N. M. ,

This review describes effects of variation in the interval between insemination and ovulation on the fertilization process in the sow. Inseminations performed too early or too late relative to ovulation decrease litter size and especially farrowing rate. This effect can be explained to a large extent by the increase in the percentage of non-fertilized eggs, resulting in partial fertilization or no fertilization at all. No effects of variation in the interval from insemina...

bp0015cpr7 | Factors Affecting Breeding Efficiency in The Pig | CPR1997

Metabolic influenceson hypothalamic–pituitary–ovarian function in the pig

Soede N. M. , Kemp B. ,

Oestrus is the period around ovulation in which sows show a standing response for boars, thus allowing the boars to mate with the sows. The duration of oestrus may vary between sows from 24 h up to 96 h, which is not related to systemic oestrogen concentrations. The moment of ovulation after onset of oestrus may vary from 10 h to 85 h. Consequently, onset of oestrus is not a good predictor for the time of ovulation. A reliable prediction of ovulation time would be worthwh...

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...

bp0017cpr16 | (1) | CPR2005

Effects of boar stimuli on the follicular phase and on oestrous behaviour in sows

Langendijk P. , Soede N.M. , Kemp B.

This review describes the role of boar stimuli in receptive behaviour, and the influence of boar stimuli during the follicular phase. Receptive behaviour (standing response) in an oestrous sow is elicited by boar stimuli, which can be olfactory, auditory, tactile, or visual. The relative importance of these stimuli is not clear. Individually, olfactory and tactile stimuli elicit a standing response in a variable percentage of sows, depending on the study, but not in all ...

bp0018cpr18 | Management of Ovarian Activity in Swine | CPR2009

Ovarian responses to laetation management strategies

Soede N.M. , Hazeleger W. , Gerritsen R. , Langendijk P. , Kemp B.

A number of lactation management strategies can be applied to reduce negative effects of lactation on post-weaning fertility. This paper focuses on effects of lactation length, Intermittent Suckling and Split Weaning on follicle development and subsequent oestrus. It is concluded that a lactation length of less than 3 weeks still leads to suboptimal reproductive performance in our modern sows. Further, both Intermittent Suckling and Split Weaning stimulate lactational fo...