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Abstract

It is possible to control follicular development in gilts and sows with the use of hormones including the progestogen altrenogest, GnRH, eCG, hCG, and porcine luteinizing hormone (pLH). These hormones can be used to develop protocols for control of estrus with artificial insemination (AI) timed to...

Author(s)
Rensis, F. de; Kirkwood, R. N.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 86, 6, pp 1460-1466
AbstractFull Text

The primary controller of weaned pig output is the successful breeding of enough females in the breeding week. The number of females available for breeding is dependent on the number of sows weaned sows and service-ready gilt availability. Primiparous (P1) sows often have longer wean-estrus...

Author(s)
Kirkwood, R. N.; Rensis, F. de
Publisher
Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
Citation
Thai Journal of Veterinary Medicine, 2016, 46, 1, pp 1-7
AbstractFull Text

This study reviewed the protocols for ovulation induction in sows by human chorionic gonadotropin (hCG) and gonadotropin releasing hormone (GnRH). In pigs, it was documented that ovulation usually occurred about 70% of the way through oestrus. However, the duration of oestrus in sows highly varies, ...

Author(s)
Tummaruk, P.; Roongsitthichai, A.; Rensis, F. de
Publisher
Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
Citation
Thai Journal of Veterinary Medicine, 2011, 41, Supplement, pp 19-23
AbstractFull Text

The objective of this study was to determine the incidence of regular or irregular inter-oestrus interval in sows during different months of the year in Northern Italy. In this study, 5,103 sows that returned to oestrus were inseminated and assigned to different groups based on the length of their...

Author(s)
Mazzoni, C.; Tonon, F.; Borri, E.; Raffi, V.; Scollo, A.; Donna, R.; Bonilauri, P.; Gherpelli, M.; Rensis, F. de
Publisher
SIVAR - Societa Italiana Veterinari per Animali da Reddito, Cremona, Italy
Citation
Large Animal Review, 2014, 20, 6, pp 255-257
Abstract

In two experiments, we examined the effect of administration of cloprostenol at artificial insemination on fertility of multiparous sows. Lactation length was 21 days and only sows exhibiting estrus by 7 days after weaning were included. Cloprostenol was administered by IM injection (175 µg; n=126) ...

Author(s)
Kirkwood, R. N.; Rensis, F. de; Silva, P.; Gherpelli, M.; Alegre, B.; Dominguez, J. C.
Publisher
Blackwell Publishing, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2007, 42, 1, pp 26-28
Abstract

Two experiments were performed to examine sow fertility following the preweaning injection of gonadotropin, In experiment 1, sows received PG600 2 days preweaning (PW2), on the day of weaning (W) or received no injection and served as controls (CT1). Compared to controls, the injection of PG600...

Author(s)
Rensis, F. de; Benedetti, S.; Silva, P.; Kirkwood, R. N.
Publisher
Elsevier Science B.V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2003, 76, 3/4, pp 245-250
Abstract

Four ovariectomised sows were kept in a climate chamber at 22°C. Blood samples were collected at 15-min intervals for 12 h daily from 30 days after ovariectomy (day 0). On days 7 and 9, animals were injected intravenously with 20 and 100 IU ACTH resp., and on days 14 and 16 with 2.5 and 20 μg GnRH...

Author(s)
Seren, E.; Mattioli, M.; Rensis, F. de
Publisher
University College Dublin, Dublin, Irish Republic
Citation
11th International Congress on Animal Reproduction and Artificial Insemination, University College Dublin, Ireland, June 26-30 1988. Volume 4. Brief communications., 1988, Paper No. 417, pp 3pp.
Abstract

Evidence was obtained that high environmental temp. inhibits adrenal activity and the function of the hypothalamic-pituitary axis in sows. It is concluded that high temp. contributes to summer infertility.

Author(s)
Seren, E.; Mattioli, M.; Rensis, F. de.
Publisher
University College Dublin., Dublin, Irish Republic
Citation
11th International Congress on Animal Reproduction and Artificial Insemination, University College Dublin, Ireland, June 26-30 1988. Volume 4. Brief communications., 1988, Paper No. 417, pp 2pp.

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