Effect of exposure to solar radiation on physiological parameters and decline estimation of milk production by crossbred cows (Holstein x Gir) in the southern Piauí State, Brazil

Dias e Silva, Tairon Pannunzio; Sousa Júnior, Severino Cavalcante; Oliveira, Ravy Guerra de; Santos, Karina Rodrigues dos

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dc.creator	Dias e Silva, Tairon Pannunzio
dc.creator	Sousa Júnior, Severino Cavalcante
dc.creator	Oliveira, Ravy Guerra de
dc.creator	Santos, Karina Rodrigues dos
dc.date	2012-12-19
dc.date.accessioned	2022-03-21T20:06:58Z
dc.date.available	2022-03-21T20:06:58Z
dc.identifier	https://comunicatascientiae.com.br/comunicata/article/view/117
dc.identifier	10.14295/cs.v3i4.117
dc.identifier.uri	http://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/77533
dc.description	This work aimed to evaluate and correlate the thermoregulatory characteristics of crossbredcows (Holstein x Gir) submitted to three different periods of exposure to solar radiation with somemeteorological variables and their effects on milk production. Were twelve lactating cows dividedinto three groups consisting of four animals each, all of the third lactation, up to five years of ageand approximately 50 days of lactation, submitted to different periods of exposure to solar radiation.Milk production per cow in kilograms was recorded in two daily milkings. The respiratory rate (RR),heart rate (RR), rectal temperature (RT) and the decline in milk production (DPL) obtained bythe difference between the weights of the morning and afternoon milkings per cow during theexperiment were collected four times a week in May and June 2011. The results revealed that thetemperature and humidity index (THI) for cows exposed to two hours of solar radiation was higherthan values considered critical for lactating cattle. The group presented three upper critical valuesfor all thermoregulatory characteristics of animals when compared with groups one and two.The thermoregulatory characteristics of animals of groups two and three groups were positivelycorrelated with the decline in milk production and differently with meteorological variables.	en-US
dc.description	Este trabalho teve o objetivo de avaliar e correlacionar as características termorreguladoras devacas mestiças (Holandês x Gir) submetidas a três períodos diferentes de exposição à radiação solarcom algumas variáveis meteorológicas e seus efeitos na produção de leite. Foram utilizadas dozevacas lactantes divididas em três grupos compostos por quatro animais cada, todos de terceiralactação, acima de cinco anos de idade e aproximadamente 50 dias de lactação, submetidosa diferentes períodos de exposição à radiação solar. A produção de leite em quilogramas porvaca foi registrada em duas ordenhas diárias. A frequência respiratória (FR), a frequência cardíaca(FR), a temperatura retal (TR) e o declínio da produção de leite (DPL) obtido pela diferença entreas pesagens das ordenhas da manhã e tarde por vaca durante o experimento foram coletadosquatro vezes por semana, em maio e junho de 2011. Os resultados revelaram que o índicetemperatura e umidade (ITU) para as vacas expostas a duas horas de radiação solar foi superior avalores considerados críticos para bovinos em lactação. O grupo três apresentou valores críticossuperiores para todas as características termorreguladoras dos animais quando comparada comos grupos um e dois. As características termorreguladoras dos animais dos grupos dois e trêscorrelacionaram-se positivamente com o declínio da produção de leite e de maneira diferentecom as variáveis meteorológicas. Effect of exposure to solar radiation on physiological parameters anddecline estimation of milk production by crossbred cows(Holstein x Gir) in the southern Piauí State, BrazilThis work aimed to evaluate and correlate the thermoregulatory characteristics of crossbredcows (Holstein x Gir) submitted to three different periods of exposure to solar radiation with somemeteorological variables and their effects on milk production. Were twelve lactating cows dividedinto three groups consisting of four animals each, all of the third lactation, up to five years of ageand approximately 50 days of lactation, submitted to different periods of exposure to solar radiation.Milk production per cow in kilograms was recorded in two daily milkings. The respiratory rate (RR),heart rate (RR), rectal temperature (RT) and the decline in milk production (DPL) obtained bythe difference between the weights of the morning and afternoon milkings per cow during theexperiment were collected four times a week in May and June 2011. The results revealed that thetemperature and humidity index (THI) for cows exposed to two hours of solar radiation was higherthan values considered critical for lactating cattle. The group presented three upper critical valuesfor all thermoregulatory characteristics of animals when compared with groups one and two.The thermoregulatory characteristics of animals of groups two and three groups were positivelycorrelated with the decline in milk production and differently with meteorological variables.	pt-BR
dc.format	application/pdf
dc.language	por
dc.publisher	Federal University of Piauí	en-US
dc.relation	https://comunicatascientiae.com.br/comunicata/article/view/117/141
dc.source	Comunicata Scientiae; Vol. 3 No. 4 (2012); 299-305	en-US
dc.source	Comunicata Scientiae; v. 3 n. 4 (2012); 299-305	pt-BR
dc.source	2177-5133
dc.source	2176-9079
dc.subject	animal welfare	en-US
dc.subject	heat stress	en-US
dc.subject	thermoregulation	en-US
dc.subject	productivity	en-US
dc.subject	bem-estar animal	pt-BR
dc.subject	estresse térmico	pt-BR
dc.subject	termorregulação	pt-BR
dc.subject	produtividade	pt-BR
dc.title	Effect of exposure to solar radiation on physiological parameters and decline estimation of milk production by crossbred cows (Holstein x Gir) in the southern Piauí State, Brazil	en-US
dc.title	Efeito da exposição à radiação solar sobre parâmetros fisiológicos e estimativa do declínio na produção de leite de vacas mestiças (Holandês X Gir) no sul do estado do Piauí	pt-BR
dc.type	info:eu-repo/semantics/article
dc.type	info:eu-repo/semantics/publishedVersion