Genetic analysis for farrowing rate and litter size for Landrace and Yorkshire sows in South China

The problem of seasonal infertility in pigs has been recognised for many years. The infertility complex can may be manifested by increased returns to service, prolonged weaning to oestrus intervals and decreased litter size. The purpose of this trial was to evaluate the effects of Buserelin treatment on fertility in sows and gilts during the seasonally infertile period.A total of 1231 mixed parity sows and gilts from five outdoor herds in East Anglia were randomly assigned to one of three treatment groups. Any sows not presented for service at first post weaning oestrus were excluded. All sows and gilts judged to be in adequate health and condition to be kept in a commercial breeding herd were included. Group C sows and gilts were given no treatment. Group R1 sows and gilts were injected i.m. with 8μg Buserelin (2.0ml Receptal; Hoechst Roussel Vet UK Ltd) on the day of service.

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Semen Viability Properties of Sexually Stimulated Boars on the Fertilization Capacity of Artificially Inseminated Large White Sows

Indian Journal of Animal Research ◽

10.18805/ijar.bf-1413 ◽

2021 ◽

Author(s):

Tshepo Teele

Keyword(s):

Litter Size ◽

Artificial Insemination ◽

Practical Method ◽

Return Rate ◽

Practical Significance ◽

Large White ◽

Sexual Stimulation ◽

Semen Collection ◽

Fertilization Capacity ◽

Farrowing Rate

Background: This study aimed to investigate the influences of sexual preparation on the effects of boars’ semen viability on the fertilization capacity of artificially inseminated sows. After all, boar sires more pigs than farrowed by a sow which the boar has been mated to improve reproductive parameters in response to AI. Methods: The semen viability of boars were studied during various sexual stimulations and analyzed during the study period. Sperm rich fractions were collected and separated at every level of sexual stimulation during the morning (08:30) and the afternoon (14:30) hours, respectively. Artificial insemination was performed following three levels of sexual preparations of boars (0 minutes of sexual restraint (MSR), 5 MSR and 10 MSR) before semen collection. Receptive sows were inseminated and evaluated for fertility traits using non-return rate, farrowing rate and litter size. Result: The non-return rate was recorded as a percentage of sows conceived after insemination over the total number of sows inseminated. The farrowing rate was recorded as a percentage of sows that farrows over the number of sows conceived and litter size as several live piglets per sow. Sexual desire was influenced by sexual preparations and significantly influenced the fertility of the artificially inseminated sows. This study is of practical significance to the animal breeder mainly because boars have greater influence than sows on the average litter size and live piglets. The study concludes that the use of at least 5 to 10 minutes of sexual restraint during the afternoon periods prior to semen collection and artificial insemination is found to be a practical method for optimizing sperm viability and fertility of sows in the intensive system.

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The effect of the weaning to oestrus interval on litter size, live born piglets and farrowing rate in sows

Journal of Animal Physiology and Animal Nutrition ◽

10.1111/j.1439-0396.1994.tb00336.x ◽

1994 ◽

Vol 71 (1-5) ◽

pp. 30-38 ◽

Cited By ~ 25

Author(s):

P. C. Vesseur ◽

B. Kemp ◽

L. A. Hartog

Keyword(s):

Litter Size ◽

Farrowing Rate

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Effects of altrenogest treatments before and after weaning on follicular development, farrowing rate, and litter size in sows1

Journal of Animal Science ◽

10.2527/jas.2010-3752 ◽

2011 ◽

Vol 89 (8) ◽

pp. 2397-2406 ◽

Cited By ~ 10

Author(s):

J. J. J. van Leeuwen ◽

M. R. T. M. Martens ◽

J. Jourquin ◽

M. A. Driancourt ◽

B. Kemp ◽

...

Keyword(s):

Litter Size ◽

Follicular Development ◽

Before And After ◽

Farrowing Rate

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A genetic analysis of litter traits in Bauscat and Giza White rabbits

Animal Science ◽

10.1017/s0003356100036710 ◽

1987 ◽

Vol 45 (1) ◽

pp. 123-134 ◽

Cited By ~ 12

Author(s):

M. H. Khalil ◽

J. B. Owen ◽

E. A. Afifi

Keyword(s):

Genetic Analysis ◽

Litter Size ◽

Litter Weight ◽

Phenotypic Correlations ◽

Large Litter ◽

Litter Traits ◽

Genetic And Phenotypic Correlations ◽

Size At Birth

AbstractAn analysis of doe productivity traits was carried out on 884 litter records including 52 sires and 210 daughters (paternal half sisters) of Bauscat (B) and Giza White (G) rabbits. Traits examined included litter size and weight at birth and at weaning, pre-weaning mortality and mean weight of young at weaning. Year-of-kindling affected most litter traits but no pattern of parity effects on litter size and pre-weaning mortality was observed. Litter weight and mean weight of young at weaning generally increased linearly as parity advanced. Litter size and weight and mean weight of young tended to increase as month of kindling advanced from October to March, and to decrease again during April and May. Pre-weaning mortality decreased as month of kindling advanced up to March and increased thereafter during April and May. The sire of the doe affected all litter traits studied, with the exception of litter size at birth and pre-weaning mortality in the B breed. Estimates of heritability for most of the litter traits were moderate or high. Genetic and phenotypic correlations among litter size traits and between litter size and litter weight traits were positive and relatively moderate or large. Litter weight traits were positively correlated both genetically and phenotypically. The genetic and phenotypic correlations between litter size traits and mean weight of young at weaning were negative and relatively moderate or large.

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Performance characteristics of sows fed enriched diet from weaning to service in a commercial flock

Nigerian Journal of Animal Production ◽

10.51791/njap.v36i1.1033 ◽

2021 ◽

Vol 36 (1) ◽

pp. 12-19

Author(s):

A. M. Orcheruata ◽

A. T. Sphine ◽

S. O. Nwokoro

Keyword(s):

Litter Size ◽

Mean Value ◽

Performance Characteristics ◽

Small Litter ◽

Commercial Flock ◽

Reproductive Life ◽

Weaning Age ◽

Production Indices ◽

Farrowing Rate ◽

Size At Birth

Fielded data from 40 sows together with obtained data from 1999 to 2005 we analysed to determine the performance of sows fed enriched diet from weaning to a service in a commercialflock. The data were on litter size at birth (LTZVT), litter size at weaning (LTZWN), weaning age (WNAGE) forrowing interval (FRINT), purity (PRTY) and reproductive life (PRODLF). Mean value of 9.44(no), 6.04(no), 31.874, 453.58d and 3.65yrs were obtained for LTZBT, LTZWN, WNAGE, FRINT and PRODLF respectively. The influence of parity on sow's performance was analyzed while mortality and sows efficiency of production were determined. Anagonistic relationship existed between production and reproduction traite. Mortality amongst piglets increased with weaning age. Over 80% of sows hold PRINT of less than 157 days, farrowed litters greater than 7 and 55% weaned litter size of over 8. Parity had no influence on sow's performancw. Sow efficiency of production indices showed that sows had 2 farrowing/year, a farrowing rate of 84% and small litter index of less than 17%. The findings of this study have indicated that better performance of sows can be achieved by giving enriched diet (flushing) from weaning to a service rather than the practice of flushing only few days to service

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Sperm concentration on the intrauterine artificial insemination in swine

Ciência e Agrotecnologia ◽

10.1590/s1413-70542009000600030 ◽

2009 ◽

Vol 33 (6) ◽

pp. 1671-1674

Author(s):

Joana Miller ◽

Ana Luísa Neves Alvarenga ◽

Luis David Solis Murgas ◽

Adriana Cristina da Silva ◽

Ricardo Sales Araújo ◽

...

Keyword(s):

Litter Size ◽

Reproductive Performance ◽

Artificial Insemination ◽

Intrauterine Insemination ◽

Sperm Concentration ◽

Conception Rate ◽

Cervical Canal ◽

Significant Difference ◽

Estrus Detection ◽

Farrowing Rate

The aim of this work was to evaluate the efficiency of the intrauterine insemination (IUI) in swine, considering the conception rate, farrowing rate, litter size (alive born pigs). For the IUI, the females had been insemination at 24 and 48 hours after the estrus detection, and the inseminating doses of 500 million, 1 billion, 1.5 billion and 2 billion spermatozoa in 20 mL extender had been used. The procedure of catheter insertion through the cervical canal was successfully performed in 97.9% of the females. The conception rate was 6.3% in the IUI. The farrowing rate in IUI was 87.2% but the farrowing rate was 100% for the sperm concentration of 500 million. Regarding the number of born pigs and alive born pigs observed in females inseminated with IUI, no significant difference was observed (p > 0.05). The concentration of 500 x 10(6) spermatozoa in 20 mL extender in the intrauterine insemination resulted in an optimal reproductive performance.

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THE INFLUENCE OF DIETARY ENERGY INTAKE DURING SUCCESSIVE LACTATIONS ON SOW PROLIFICACY

Canadian Journal of Animal Science ◽

10.4141/cjas88-029 ◽

1988 ◽

Vol 68 (1) ◽

pp. 283-290 ◽

Cited By ~ 19

Author(s):

R. N. KIRKWOOD ◽

B. N. MITARU ◽

A. D. GOONERATNE ◽

R. BLAIR ◽

P. A. THACKER

Keyword(s):

Energy Intake ◽

Litter Size ◽

High Energy ◽

Dietary Energy ◽

Maternal Weight ◽

Digestible Energy ◽

Dietary Energy Intake ◽

Effect Of Treatment ◽

Sow Lactation ◽

Farrowing Rate

From selection prior to the production of their first litters, 101 Yorkshire × Landrace sows were allocated to be ad libitum fed either a control (CE) or high energy diet (HE) during each of four successive lactations. Diets CE and HE supplied 13.7 and 15.6 MJ. DE kg−1, respectively. Sows were treated similarly during each gestation. Although HE sows tended to have a greater digestible energy intake, they lost more weight during each lactation (P < 0.05). Maternal weight gains between each farrowing decreased with successive parities (P < 0.05). Litter size at the second and subsequent farrowings was greater (P < 0.05) for the HE than CE sows. The overall mean litter size for the HE and CE sows was 10.1 and 9.3 piglets, respectively. A similar trend was noted for live births (9.7 vs. 8.9) and numbers weaned (8.3 vs. 7.9). There was no consistent effect of treatment on pig weights at birth or 21 d of lactation. No treatment or parity effects were evident for preweaning pig mortality. The weaning to conception interval was longer for HE sows in the first parity (14.9 vs. 11.1 d), but more CE sows were culled for reproductive problems. No treatment effects were noted for mean interval to conception, proportion mated within 8 d or subsequent farrowing rate in parities 2, 3 or 4. There was no effect of initial gilt breeding weight on the ability to produce up to four litters. It is concluded that low lactation digestible energy intake may limit subsequent litter size. Key words: Sow, lactation, nutrition, reproductive performance

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