Daily gain and age and weight at puberty in purebred and crossbred Duroc, Landrace and Large White gilts

Irgang, Renato; Scheid, I.R.; Fávero, J. A.; Wentz, Ivo

doi:10.1016/s0301-6226(12)80010-8

Cited by 7 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is likely due to the fact that puberty attainment is very tedious to detect. However, the delayed puberty of LW gilts as compared to LF gilts and the earlier sexual maturity of crossbred gilts as compared to pure breeds in the present study is in agreement with most other results in the literature (Christenson, 1981;Hutchens et al, 1982;Legault and Caritez, 1983;Allrich et al, 1985;Irgang et al, 1992). Heterosis effects could not be estimated without bias in this study because the LW x LF reciprocal cross was lacking, so that heterosis and maternal effects were confounded.…”

Section: Discussionsupporting

confidence: 93%

Genetic variability of age and weight at puberty, ovulation rate and embryo survival in gilts and relations with production traits

Bidanel¹,

Gruand²,

Legault³

1996

Genet Sel Evol

View full text Add to dashboard Cite

Age (AFE), weight (WFE) and ovulation rate (OR) at first estrus, number of embryos (NE) and embryo survival (ES = NE/OR) at 30 days of gestation of French Large White (LW), French Landrace (LF) and crossbred LW x LF gilts and their genetic relationships with average daily gain between 30 and 85 kg (ADG) and average backfat thickness at 85 kg (ABT) were analyzed. Breed differences, as well as genetic parameters in the LW breed, were estimated using a restricted maximum likelihood procedure applied to a multiple trait animal model. A total of 3 664 male and female pigs were measured for ADG and ABT between 1966 and 1979; 1 919 gilts were checked daily for puberty between 140 and 300 days of age. Most females were then bred and slaughtered at 30 days of gestation for measuring the number of corpora lutea and the number of embryos. Breed marginal means were,

show abstract

Section: Discussionsupporting

confidence: 93%

Genetic variability of age and weight at puberty, ovulation rate and embryo survival in gilts and relations with production traits

Bidanel¹,

Gruand²,

Legault³

1996

Genet Sel Evol

View full text Add to dashboard Cite

show abstract

“…Subsequent selection for litter size produced a significant increase in litter size (Lamberson et al, 1991 (Tess et al, 1983;Rydhmer, 1993). Moreover, early puberty may improve genetic progress by shortening the generation interval (Hixon et al, 1987 (Ollivier, 1977(Ollivier, , 1980 (Groeneveld, 1993 (Christenson, 1981;Hutchens et al, 1982;Legault and Caritez, 1983;Allrich et al, 1985;Irgang et al, 1992). Heterosis effects could not be estimated without bias in this study because the LW x LF reciprocal cross was lacking, so that heterosis and maternal effects were confounded.…”

mentioning

confidence: 91%

Genetic variability of age and weight at puberty, ovulation rate and embryo survival in gilts and relations with production traits

Bidanel¹,

Legault²

1996

Genet. Sel. Evol.

View full text Add to dashboard Cite

show abstract

“…However, under clinical/pre-clinical conditions, the age at rst observed oestrus is used to de ne puberty in gilts. Published articles report a range between 23 to 30 weeks of age for appearance of the st sanding oestrus (13,15,16). Control gilts started to show oestrus from 19, 21, and 22 weeks of age, with an average of 23 weeks of age for the pre-clinical study, and 25 weeks of age for the clinical studies; with a prevalence of 83.3%, 40.0% and 22.5% respectively.…”

Section: Discussionmentioning

confidence: 99%

Assessment of the efficacy of a gonadotropin releasing factor (GnRF) analog to suppress ovarian function in gilts under pre-clinical and clinical conditions

Genís,

King,

Aluwé

et al. 2024

Preprint

View full text Add to dashboard Cite

Background The administration of a gonadotropin releasing factor (GnRF) analog to pigs has proven to induce antibodies against endogenous GnRF. In gilts (young female pigs), the subsequent blocking of GnRF activity by specific antibodies results in a temporary suppression of ovarian activity and sexual maturation. One pre-clinical and two clinical studies were conducted to assess the ability of the GnRF analog to produce immunologically suppression of the ovarian function, preventing gilts from reaching puberty before harvest, at 27 weeks of age. Results In the three studies, a significant reduction of size and weight of reproductive organs and gilts in oestrus was demonstrated in vaccinated gilts compared with intact gilts. A significant increase in anti-GnRF antibody levels in sera was observed after the second dose, which lasted until the end of the study in each of the protocols used. Progesterone levels were significantly reduced from 6 and 8 weeks after 2nd vaccination in clinical studies 2 and 1 respectively, and from 6 weeks after 2nd vaccination in the pre-clinical study. Estradiol levels were below the limit of detection for clinical study 2 and significantly reduced in vaccinated gilts at the end of the pre-clinical study and the clinical study 1. Conclusions Vaccination of gilts with a GnRF analog with two different protocols (first dose from 10 or 14 weeks of age, and a second dose 8 weeks or 4 weeks later) was effective in reducing the development of puberty for at least 9 weeks post 2nd dose. These results confirm the flexibility of vaccination programs for veterinarians and producers which can be adapted to pig management practices in commercial farms.

show abstract

Daily gain and age and weight at puberty in purebred and crossbred Duroc, Landrace and Large White gilts

Cited by 7 publications

References 24 publications

Genetic variability of age and weight at puberty, ovulation rate and embryo survival in gilts and relations with production traits

Genetic variability of age and weight at puberty, ovulation rate and embryo survival in gilts and relations with production traits

Genetic variability of age and weight at puberty, ovulation rate and embryo survival in gilts and relations with production traits

Assessment of the efficacy of a gonadotropin releasing factor (GnRF) analog to suppress ovarian function in gilts under pre-clinical and clinical conditions

Contact Info

Product

Resources

About