Studies in sow reproduction. 2. The effect of lactation length on the subsequent reproductive performance of the sow

Cole, D. J. A.; Varley, M. A.; Hughes, P. E.

doi:10.1017/s0003356100041192

Cited by 49 publications

(15 citation statements)

References 4 publications

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“…A large degree of variation in the weaning to oestrus interval in a herd results in reduced productivity because good conception rates require good service management which is not possible when service procedures interfere with other stock tasks. The variation in the weaning to oestrus interval is increased as duration of lactation is shortened (Self & Grummer, 1958 ;Smidt, Scheven & Steinbach, 1965;van der Heyde, 1972;Cole, Varley & Hughes, 1975). Exogenous hormone therapy as a means of inducing oestrus during lactation has had limited success and has often involved a series of injections which is both time consuming and impractical (Cole & Hughes, 1946 ;Heitman & Cole, 1956; Crighton, 1970;Guthrie, Pursel & Frobish, 1978).…”

Section: Introductionmentioning

confidence: 99%

Response of sows to oestradiol benzoate treatment after weaning at two stages of lactation

Edwards¹,

Foxcroft²

1983

Reproduction

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Section: Introductionmentioning

confidence: 99%

Response of sows to oestradiol benzoate treatment after weaning at two stages of lactation

Edwards¹,

Foxcroft²

1983

Reproduction

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“…Sows weaned from their litters following lactation lengths of less than 3 weeks are characterized by an increased interval from weaning to the next oestrus and by a reduction in litter size at the next farrowing (Smidt, Scheven and Steinbach, 1965;Aumaitre and Rettagliati, 1972;te Brake, 1972;Cole, Varley and Hughes, 1975;Varley and Cole, 1976).…”

Section: Introductionmentioning

confidence: 99%

Studies in sow reproduction 5. The effect of lactation length of the sow on the subsequent embryonic development

Varley¹,

Cole²

1976

Anim. Sci.

Self Cite

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Forty-five female pigs (sows) were allocated at random to one of three lactation lengths: 7 days, 21 days, 42 days. All sows were remated at the first post-weaning oestrus and were slaughtered at 20 days post coitum. The reproductive tracts were removed, dissected and examined. Ovulation rates as determined by luteal count were similar for all three groups, but the number of viable embryos decreased significantly (P<0-05) from 13-0 for the 42-day lactation group to 9-2 for the 7-day lactation group. This difference was reflected in a significant (P < 0-01) reduction in the percentage embryo survival rate as lactation length was reduced. Uterine lengths for the 7-day lactation group were significantly (P < 0-05) shorter than the other two groups. Six sows in each treatment group were blood sampled: at weaning, at remating, at 2 days post-mating, at 10 days post-mating and at 20 days post-mating. The plasma samples obtained were assayed for progesterone. No differences were observed between treatment groups for plasma progesterone concentration at any of the sampling times. It is concluded that the reduction of the litter size at the next farrowing following a short lactation length is largely a result of increased embryo death in the first 20 days of gestation.

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“…A redução da idade do desmame constitui-se na forma mais efetiva de aumento do número de ciclos reprodutivos anuais (COLE et al, 1975;FREITAS et al, 1997). Nesse sentido, o desmame precoce segregado (DPS) apresenta-se como nova tecnologia para a otimização da eficiência reprodutiva e produtiva dos plantéis, pelo aumento do número de partos por porca por ano e pela redução dos efeitos negativos decorrentes da ação de certas doenças que acometem os rebanhos (PASSOS, 1997).…”

Section: Introductionunclassified

Edulcorante na água de consumo e efeitos sobre o desempenho e o desenvolvimento da mucosa intestinal de leitões submetidos ao desmame precoce segregado

Silva

Rocha²,

Machado³

et al. 2000

R. Bras. Zootec.

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RESUMO -Um experimento foi realizado com o objetivo de verificar os efeitos da indução do consumo de água com edulcorante, na fase de berçário (10 aos 30 dias de idade), sobre o desempenho de 270 leitões (machos e fêmeas) submetidos ao desmame precoce segregado e os efeitos residuais nas fases de pré-creche (30 aos 45 dias) e de creche (45 aos 62 dias de idade). Três tratamentos com dois sexos e três repetições (fatorial 3 x 2) foram utilizados dos 10 aos 30 dias de idade dos leitões, sendo: T1-água sem edulcorante, T2 -água com edulcorante e T3 -água com e sem edulcorante oferecidos simultaneamente em bebedouros distintos. Foram avaliados o ganho diário de peso, o consumo diário de ração e a conversão alimentar. O consumo diário de água somente foi medido na fase de berçário. A incidência de diarréia foi observada até o 10 o dia após o desmame. Aos 22 dias de idade, seis leitões por tratamento foram sacrificados para avaliação da altura das vilosidades e profundidade das criptas da mucosa do duodeno e jejuno. Não foram observadas diferenças para as variáveis estudadas, exceto para o ganho diário de peso e consumo diário de ração nas fases compreendidas entre 30 e 45 dias e 45 e 62 dias e para o ganho diário de peso entre 10 e 62 dias, a favor das fêmeas. O uso de edulcorante na água não influenciou o consumo de água, o desempenho dos leitões e a qualidade da mucosa intestinal.Palavras-chave: água, edulcorante, leitões, suínos Sweetener in the Drinking Water and Effects on Performance and on the Development of Intestinal Mucosa for Piglets Subject to Segregated Early WeanedABSTRACT -An experiment was conducted with the objective to evaluate the effects of the induction of the drinking water with sweetener consumption in the nursery phase (10 th to 30 th day of age), on the performance of 270 piglets (male and females) submitted to segregated early weaned and its residual effects on their pre nursery (30 th to 45 th day) and nursery phases (45 th to 62 nd day) were evaluated. A completely randomized design in a 3 x 2 factorial arrangement with three treatments with two sexes and three replications were used from 10 to 30 days of age of the piglets. The treatment were: T1-drinking water without sweetener; T2 -drinking water with sweetener and T3 -drinking water with and without sweetener simultaneously offered. Average daily gain, daily feed intake and feed: gain was recorded at 30 th , 45 th and 62 nd days. Daily drinking water consumption was recorded only from the 10 th to 30 th day. Six piglets per treatment were slaughtered at the 22 nd day and a medium part of the duodenum and jejunum samples were collected to measure villi height and crypt depth. Diarrhea incidence was observed up to 10 days after weaning. It was not observed differences for the studied variables, except for average daily gain and daily feed intake from 30 th to 45 th and 45 th to 62 nd days phases and for average daily gain from 10 th to 62 nd days that favored the female piglets. The use of drinking water with sweetener did not affect the...

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Studies in sow reproduction. 2. The effect of lactation length on the subsequent reproductive performance of the sow

Cited by 49 publications

References 4 publications

Response of sows to oestradiol benzoate treatment after weaning at two stages of lactation

Response of sows to oestradiol benzoate treatment after weaning at two stages of lactation

Studies in sow reproduction 5. The effect of lactation length of the sow on the subsequent embryonic development

Edulcorante na água de consumo e efeitos sobre o desempenho e o desenvolvimento da mucosa intestinal de leitões submetidos ao desmame precoce segregado

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