Effect of Elevated Ambient Temperatures on Puberty in Gilts

Flowers, B.; Cantley, T.C.; Martin, Michael; Day, Billy N.

doi:10.2527/jas1989.673779x

Cited by 50 publications

(34 citation statements)

References 20 publications

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“…Hot and humid summer climate causes heat stress reducing reproductive performance and longevity of sows [21,22]. Studies showed that heat stress diminished the secretion of FSH and LH, and delayed puberty in gilts [18,21].…”

Section: Introductionmentioning

confidence: 99%

Improving efficiency of sow productivity: nutrition and health

Kim

Weaver

Yan

et al. 2013

J Animal Sci Biotechnol

144

132

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This reviews research focused to understand the nutrient requirement and balance to meet the needs of fetal growth, mammary growth, and milk production. This summary will handle how feeding strategies can be adjusted according to the nutrient needs for a sow to enhance productivity and health. Most research data used in this summary are based on the studies conducted by the authors between 1996 and 2013. Nutrient requirements of sows are affected by stage of gestation and parity of sows. Dietary antioxidant concentrations need to be re-evaluated for its sufficiency in sow diets especially to prevent excessive oxidative stress during late gestation and lactation. When feeding sows, consideration of phase feeding of gestating sows and parity feeding of lactating sows could enhances production longevity and health of sows. Use of selected nutrients and additives seems to help productivity and health of sows.

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Section: Introductionmentioning

confidence: 99%

Improving efficiency of sow productivity: nutrition and health

Kim

Weaver

Yan

et al. 2013

J Animal Sci Biotechnol

144

132

View full text Add to dashboard Cite

show abstract

“…Para as matrizes suínas a temperatura ambiente considerada de conforto varia entre 7 e 23 °C (Noblet et al, 1989;Lucas & Cruz, 1997); entretanto, altas temperaturas no interior das instalações influenciam negativamente a eficiência reprodutiva, com redução da fertilidade (Peltoniemi et al, 1999), em especial em fêmeas primíparas, além de atraso da maturidade sexual (Flores et al, 1989;Perez & Gutierez, 1987) e maior mobilização de gordura corporal durante a lactação (Barb et al, 1991).…”

Section: Introductionunclassified

Caracterização bioclimática de sistemas ao ar livre e confinado para a criação de matrizes suínas gestantes

Nazareno

Silva

Nunes

et al. 2012

Rev. bras. eng. agríc. ambient.

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R ESU M OO confinamento de matrizes suínas foi criado com o intuito de maximizar a produtividade; entretanto, existem problemas relacionados ao bem-estar animal. Objetivou-se avaliar a criação de matrizes suínas gestantes no sistema de confinamento e ao ar livre, com relação ao ambiente térmico e às respostas fisiológicas. O experimento foi realizado em Monte Mor/SP. A avaliação fisiológica foi realizada por meio do registro das variáveis: frequência respiratória e temperatura de pele. Foram registradas as variáveis meteorológicas: temperatura de bulbo seco, temperatura de bulbo úmido e temperatura de globo negro, caracterizando o ambiente por meio da entalpia e índice de temperatura de globo e umidade. Foram utilizados seis animais por tratamento. O delineamento experimental foi inteiramente casualizado em parcelas subdivididas, e as médias comparadas pelo teste de Tukey. As variáveis fisiológicas e meteorológicas apresentaram valores superiores no confinamento. O sistema de criação ao ar livre potencializou as trocas térmicas entre os animais e o ambiente, o que refletiu em menor estresse por calor observado nos animais.Palavras-chave: suíno, bem-estar animal, conforto térmico, sistemas de produção Bioclimatic characterization of outdoor and confined systems for pregnant sows A B ST R A C T Pregnant sows confinement systems were created in order to maximize the productivity, however there are problems concerning the animal welfare. The aim of this research was to evaluate pregnant sows in outdoors and in confinement systems in relation to the thermal environment and physiological animal responses. The experiment was conducted in a commercial farm in Monte Mor city, São Paulo, Brazil. The physiological evaluation was performed by recording physiological variables, such as respiratory frequency and skin temperature. Furthermore, variables like dry bulb temperature, wet bulb temperature, and black globe temperature were also evaluated to characterize the ambient by means of enthalpy and black globe humidity index. In each treatment six animals were evaluated. The experimental design was completely randomized in a split-plot version whose averages were compared by the Tukey test. The findings of the experiment revealed higher values for all the bioclimatic variables in the confined treatment. Hence, the outdoor system provided better thermal conditioning for pigs, resulting in a lower heat stress.

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“…Thus, in addition to PP it appears that high temperature is seasonal environment factor that can delay puberty in gilts. A previous study has suggested that the effect of elevated temperatures on delayed puberty is due to one or both of the following factors; reduced concentrations of gonadotropins and decreased responsiveness of the ovary to gonadotropins (Flowers et al, 1989). Fig.…”

Section: Discussionmentioning

confidence: 97%