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Elevated temperature-humidity index induces physiological, blood and milk alterations in Holstein cows in a more pronounced manner than in ½ and ¾ Holstein × Gir. Repositório Alice
STUMPF, M. T.; KOLLING, G. J.; FISCHER, V.; DALTRO, D. dos S.; ALFONZO, E. P. M.; DALCIN, V. C.; DIAS, L. T.; SILVA, M. V. G. B.; PERIPOLLI, V.; MCMANUS, C. M..
Bos taurus taurus and Bos taurus indicus cattle subspecies present different capabilities in coping with situations of elevated temperatures, the latter being more tolerant to heat stress. Thus, some breeding programs crossed these subspecies to produce a high producing yet heat-tolerant breed (Girolando). Nineteen Holstein (H100) and 19 Girolando cows [(½ Holstein × Gir (H50) and ¾ Holstein × Gir (H75)] with similar milk production were used in a six-day experiment to evaluate the consequences of heat stress due to shade deprivation on their physiological, blood and milk traits. Cows were exposed to a non-shaded environment between morning (06:00h; GMT -3:00) and evening milking (14:30h; GMT -3:00) with access to water ad libitum. Procedures were...
Tipo: Artigo de periódico Palavras-chave: Blood alterations; Alteração sanguínea; Tolerância ao calor; Gado Leiteiro; Produção Leiteira; Fisiologia; Dairy cattle; Heat tolerance; Milk yield; Physiology.
Ano: 2021 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1136549
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Infrared thermography as a method for evaluating the heat tolerance in dairy cows. Repositório Alice
DALTRO, D. dos S.; FISCHER, V.; ALFONZO, E. P. M.; DALCIN, V. C.; STUMPF, M. T.; KOLLING, G.; SILVA, M. V. G. B.; McMANUS, C. M..
Tipo: Artigo de periódico Palavras-chave: Thermal comfort; Thermographic images.; Animal welfare; Dairy cattle..
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1080192
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Physiological parameters for thermal stress in dairy cattle. Repositório Alice
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..
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...
Tipo: Separatas Palavras-chave: Broken line; Critical values; Thermal comfort.; Animal comfort; Thermoregulation..
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1058404
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