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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
12/12/2016 |
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Data da última atualização: |
23/01/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
DALCIN, V. C.; FISCHER, V.; DALTRO, D. dos S.; ALFONZO, E. P. M.; STUMPF, M. T.; KOLLING, G. J.; SILVA, M. V. G. B.; McMANUS, C. |
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Afiliação: |
Vanessa Calderaro Dalcin, UFRGS; Vivian Fischer, UFRGS; Darlene dos Santos Daltro, UFRGS; Evelyn Priscila München Alfonzo, UFRGS; Marcelo Tempel Stumpf, Universidade Federal do Rio Grande, São Lourenço do Sul, RS; Giovani Jacob Kolling, UFRGS; MARCOS VINICIUS GUALBERTO B SILVA, CNPGL; Concepta McManus, UNB. |
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Título: |
Physiological parameters for thermal stress in dairy cattle. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Revista Brasileira de Zootecnia, v. 45, n. 8, p. 458-465, 2016. |
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Idioma: |
Inglês |
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Conteúdo: |
The objective of this study was to investigate changes in physiological parameters of dairy cows and understand which physiological parameters show greater reliability for verification of heat stress. Blood samples were collected for analysis and included hematocrit (Ht), erythrocyte count (ERY), and hemoglobin count (HEMO). In addition, physiological variables, including rectal temperature (RT), heart rate (HR), respiratory rate (RR), and panting score (PS) were recorded in 38 lactating cows. These varied according to genetic group (½, ¾, and pure bred Holstein (HO)). Analysis of variance considering the effects of genetic group, days, and their interaction as well as linear and quadratic effect of the black globe humidity index (BGHI) was performed, as well as broken-line regression. These values were higher in pure HO than in ¾ and ½ groups. The average BGHI during the morning was 74, when 70, 43, and 13% of pure HO, ¾, and ½, respectively, presented RR above reference value. The RR was the best indicator of heat stress and its critical value was 116 breaths/min for ½, 140 for ¾, and 168 breaths/min for pure HO cows. In the HO group, physiological variables increased linearly with BGHI, without presenting inflection in the regression. The inflection point occurred at a higher BGHI for the ½ group compared with the other groups. Hematocrit and HEMO were different among genetic groups and did not vary with BGHI, showing that stress was not sufficient to alter these hematological parameters. The ½ HO group was capable of maintaining normal physiological parameters for at least 3 BGHI units above that of HO and 1 to 3 units higher than ¾ HO for RR and RT, respectively. Respiratory rate is the physiological parameter that best predicts heat stress in dairy cattle, and the 1/2 Holstein group is the best adapted to heat stress. MenosThe objective of this study was to investigate changes in physiological parameters of dairy cows and understand which physiological parameters show greater reliability for verification of heat stress. Blood samples were collected for analysis and included hematocrit (Ht), erythrocyte count (ERY), and hemoglobin count (HEMO). In addition, physiological variables, including rectal temperature (RT), heart rate (HR), respiratory rate (RR), and panting score (PS) were recorded in 38 lactating cows. These varied according to genetic group (½, ¾, and pure bred Holstein (HO)). Analysis of variance considering the effects of genetic group, days, and their interaction as well as linear and quadratic effect of the black globe humidity index (BGHI) was performed, as well as broken-line regression. These values were higher in pure HO than in ¾ and ½ groups. The average BGHI during the morning was 74, when 70, 43, and 13% of pure HO, ¾, and ½, respectively, presented RR above reference value. The RR was the best indicator of heat stress and its critical value was 116 breaths/min for ½, 140 for ¾, and 168 breaths/min for pure HO cows. In the HO group, physiological variables increased linearly with BGHI, without presenting inflection in the regression. The inflection point occurred at a higher BGHI for the ½ group compared with the other groups. Hematocrit and HEMO were different among genetic groups and did not vary with BGHI, showing that stress was not sufficient to alter these hematolo... Mostrar Tudo |
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Palavras-Chave: |
Broken line; Critical values; Thermal comfort. |
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Thesaurus Nal: |
Animal comfort; thermoregulation. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/151585/1/Cnpgl-2016-RevBrasZoot-Physiological.pdf
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Marc: |
LEADER 02612naa a2200265 a 4500
001 2058404
005 2023-01-23
008 2016 bl uuuu u00u1 u #d
100 1 $aDALCIN, V. C.
245 $aPhysiological parameters for thermal stress in dairy cattle.$h[electronic resource]
260 $c2016
520 $aThe objective of this study was to investigate changes in physiological parameters of dairy cows and understand which physiological parameters show greater reliability for verification of heat stress. Blood samples were collected for analysis and included hematocrit (Ht), erythrocyte count (ERY), and hemoglobin count (HEMO). In addition, physiological variables, including rectal temperature (RT), heart rate (HR), respiratory rate (RR), and panting score (PS) were recorded in 38 lactating cows. These varied according to genetic group (½, ¾, and pure bred Holstein (HO)). Analysis of variance considering the effects of genetic group, days, and their interaction as well as linear and quadratic effect of the black globe humidity index (BGHI) was performed, as well as broken-line regression. These values were higher in pure HO than in ¾ and ½ groups. The average BGHI during the morning was 74, when 70, 43, and 13% of pure HO, ¾, and ½, respectively, presented RR above reference value. The RR was the best indicator of heat stress and its critical value was 116 breaths/min for ½, 140 for ¾, and 168 breaths/min for pure HO cows. In the HO group, physiological variables increased linearly with BGHI, without presenting inflection in the regression. The inflection point occurred at a higher BGHI for the ½ group compared with the other groups. Hematocrit and HEMO were different among genetic groups and did not vary with BGHI, showing that stress was not sufficient to alter these hematological parameters. The ½ HO group was capable of maintaining normal physiological parameters for at least 3 BGHI units above that of HO and 1 to 3 units higher than ¾ HO for RR and RT, respectively. Respiratory rate is the physiological parameter that best predicts heat stress in dairy cattle, and the 1/2 Holstein group is the best adapted to heat stress.
650 $aAnimal comfort
650 $athermoregulation
653 $aBroken line
653 $aCritical values
653 $aThermal comfort
700 1 $aFISCHER, V.
700 1 $aDALTRO, D. dos S.
700 1 $aALFONZO, E. P. M.
700 1 $aSTUMPF, M. T.
700 1 $aKOLLING, G. J.
700 1 $aSILVA, M. V. G. B.
700 1 $aMcMANUS, C.
773 $tRevista Brasileira de Zootecnia$gv. 45, n. 8, p. 458-465, 2016.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
21/12/2009 |
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Data da última atualização: |
21/12/2009 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
TORRE NETO, A.; VAZ, C. M. P.; MILORI, D. M.; JORGE, L. A. C.; RABELLO, L. M.; MATTOSO, L. H. C.; INAMASU, R. Y.; BASSANESI, R. B.; SCHEPERS, J. S. |
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Afiliação: |
ANDRE TORRE NETO, CNPDIA; CARLOS MANOEL PEDRO VAZ, CNPDIA; DEBORA MARCONDES BASTOS P MILORI, CNPDIA; LUCIO ANDRE DE CASTRO JORGE, CNPDIA; LADISLAU MARCELINO RABELLO, CNPDIA; LUIZ HENRIQUE CAPPARELLI MATTOSO, CNPDIA; RICARDO YASSUSHI INAMASU, CNPDIA. |
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Título: |
Instrumented citrus production. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
In: ALBRIGO, L. G.; EHSANI, R. (Ed.). Proceedings of the international symposium on application on precision agriculture for fruits and vegetables. Leaven: ISHS, 2009. p. 101-112. |
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Série: |
(Acta Horticulturae, 824). |
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Idioma: |
Inglês |
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Thesaurus NAL: |
Citrus. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00737naa a2200229 a 4500
001 1578495
005 2009-12-21
008 2009 bl --- 0-- u #d
100 1 $aTORRE NETO, A.
245 $aInstrumented citrus production.
260 $c2009
490 $a(Acta Horticulturae, 824).
650 $aCitrus
700 1 $aVAZ, C. M. P.
700 1 $aMILORI, D. M.
700 1 $aJORGE, L. A. C.
700 1 $aRABELLO, L. M.
700 1 $aMATTOSO, L. H. C.
700 1 $aINAMASU, R. Y.
700 1 $aBASSANESI, R. B.
700 1 $aSCHEPERS, J. S.
773 $tIn: ALBRIGO, L. G.; EHSANI, R. (Ed.). Proceedings of the international symposium on application on precision agriculture for fruits and vegetables. Leaven: ISHS, 2009. p. 101-112.
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