Taxa de gestação em fêmeas da raça Holandesa confinadas em free stall, no verão e inverno

Pires, Maria de Fátima Ávila; Ferreira, A. C. de B.; Saturnino, H.M.; Teodoro, R. L.

doi:10.1590/s0102-09352002000100009

Cited by 20 publications

(15 citation statements)

References 12 publications

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“…The RF pattern of variation along the day was very similar to that observed for DBT in summer, where greater values were registered in the hottest hours of the day, differently from the RT that showed greater values at the end of the day even with mild temperatures. Similar findings were reported by Pires et al (2002) who evaluated RT of Holstein cows in free stalls with free access to a solarium and found RT values of 38.9°C at 0900 hours and 39.3°C at 2100 hours. The authors suggested that greater RT were observed at night due to animals not having enough time to recover from the high DBT observed during the afternoon.…”

Section: Discussionsupporting

confidence: 88%

Alternative body sites for heat stress measurement in milking cows under tropical conditions and their relationship to the thermal discomfort of the animals

et al. 2009

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This study was conducted to determine the relationship among temperatures measured at different anatomical sites of the animal body and their daily pattern as indicative of the thermal stress in lactating dairy cows under tropical conditions. Environmental dry bulb (DBT) and black globe (BGT) temperatures and relative humidity (RH) were recorded. Rectal temperature (RT), respiratory frequency (RF), body surface (BST), internal base of tail (TT), vulva (VT) and auricular temperatures (AT) were collected, from 37 Black and White Holstein cows at 0700, 1300 and 1800 hours. RT showed a moderately and positive correlations with all body temperatures, ranging from 0.59 with TT to 0.64 with BST. Correlations among AT, VT and TT with RF were very similar (from 0.63 to 0.64) and were greater than those observed for RF with RT (0.55) or with BST (0.54). RF and RT were positively correlated to TT (0.63 and 0.59, respectively), AT (r = 0.63 for both) and VT (r = 0.64 and 0.63, respectively). Positive and very high correlations were observed among AT, VT and TT (from 0.94 to 0.97) indicating good association of temperatures measured in these anatomical sites. Correlations of BST with AT and VT were positive and very similar (0.71 and 0.72, respectively) and lower with TT (0.66). The AT, TT, VT and BST presented similar patterns and follow the variations of DBT through the day. Temperatures measured at different anatomical sites of the animal body have the potential to be used as indicative of the thermal stress in lactating dairy cows.

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Section: Discussionsupporting

confidence: 88%

Alternative body sites for heat stress measurement in milking cows under tropical conditions and their relationship to the thermal discomfort of the animals

et al. 2009

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“…O estresse calórico pode ser considerado um dos principais fatores limitantes à produção de bovinos em clima quente (Silva, 2000), pois as elevadas temperaturas podem interferir no consumo de alimentos (Beede & Collier, 1986;Damasceno et al, 1998;Silanikove, 2000), no ganho de peso (Santos, 1999), nas taxas reprodutivas (Bényei & Barros, 2000;Pires et al, 2002) e na produção de leite (Damasceno et al, 1998;Martello et al, 2004).…”

Section: Introductionunclassified

Comportamento ingestivo e parâmetros fisiológicos de bovinos Sindi alimentados com teores crescentes de feno de erva-sal

Oliveira

Turco

Araújo

et al. 2012

Agraria

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RESUMOObjetivou-se avaliar o efeito das variáveis meteorológicas e das dietas com diferentes níveis de feno de ervasal (Atriplex nummularia Lindl.) e palma forrageira (Opuntia fícus indica Mill) sobre as respostas horárias dos parâmetros fisiológicos e comportamento ingestivo dos novilhos da raça Sindi. Foram utilizados oito animais da raça Sindi, distribuídos em quadrado latino duplo com quatro tratamentos: 15, 30, 45 e 60% de inclusão de feno de erva-sal, em quatro períodos. As variáveis meteorológicas ao longo do dia exerceram forte influência sobre todas as respostas fisiológicas dos animais. Entretanto, a distribuição das atividades do comportamento ingestivo (alimentação, ruminação e ócio), ao longo das 24 horas, foi ritmada pelos horários de distribuição do alimento, mostrando-se pouco influenciada pelas variáveis meteorológicas. O consumo das dietas experimentais, contendo os menores percentuais de feno de erva-sal pelos novilhos da raça Sindi, proporcionaram aumento na frequência respiratória dos animais, sem, no entanto, alterar a temperatura retal. Palavras-chave:Bem-estar, bioclimatologia, palma forrageira, semiárido, temperatura.Ingestive behavior and physiological parameters of Sindhi cattle fed increasing levels of saltbush hay ABSTRACTThe aim of this study was to evaluate the effect of the meteorological variables and the diets with different saltbush hay (Atriplex nummularia Lindl.) and forage (Opuntia fícus indica Mill) levels on the hourly responses of the physiological parameters and ingestive behavior of Sindi steers. Eight Sindhi breed animals were allotted to a double Latin square with four treatments: 15, 30, 45 and 60% inclusion of saltbush hay, in four periods. The meteorological variables throughout the day strongly influenced all physiological responses of the cattle. However, the distribution of the activities of ingestive behavior (eating, ruminating and idling), over 24 hours, was punctuated by the food distribution periods, proving to be little influenced by the meteorological variables. The consumption of the experimental diets containing the lowest percentage of saltbush hay by the Sindhi steers increased the respiratory rate of the animals, however, without changing the rectal temperature.

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“…Barbosa et al (2011) reported a seasonal effect on crossbred dairy cows that showed a conception rate of 42.55% in autumnwinter and 25% in spring-summer. Additionally, Pires et al (2002) found a significant difference on the conception rate of confined Holstein cows after conventional AI in summer and winter, which was confirmed by high variation in THI values occurring in different seasons in the region where the trial was conducted (75.8 in summer vs. 65.3 in winter).…”

Section: Resultsmentioning

confidence: 56%

Conception rate and estrous return detection after TAI in Holstein cows

Campos

Santos

2015

Sem. Ci. Agr.

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The aim of this study was to evaluate the influence of season-of-the-year at the moment of calving and insemination, days in milk (DIM) and the presence of corpus luteum (CL) at the onset of hormonal protocol on conception and estrous return detection rates. Multiparous lactating Holstein cows were submitted to the timed artificial insemination (TAI) protocol: Day 0 -insertion of progesterone releasing intravaginal device (CIDR ® , Zoetis) and an intramuscular injection of 0.02 mg of gonadorelin (GnRH, Fertagyl ® , MSD); Day 7 -12.5 mg of dinoprost tromethamine (PGF 2α , Lutalyse ® , Zoetis) and removal of the device; Day 8 -1.0 mg of estradiol cypionate (ECP ® , Zoetis); Day 10 -TAI. Pregnancy diagnosis was performed 32 days post-AI using ultrasonography. Cows that had estrous return before pregnancy diagnosis were re-inseminated, conventionally, 12 hours after estrous detection. Trained employees observed cows for signs of estrous twice daily, in the morning and afternoon, for approximately 30 minutes. Cows that did not become pregnant were resynchronized using the same protocol. Data was analyzed by logistic regression in Minitab program. Significance level of P < 0.05 was adopted. A total of 406 inseminations were performed, which resulted in 101 pregnancies with a conception rate of 24.87%. Estrous return detection rate was 43.27%. Season of year at calving (P = 0.930), DIM (P = 0.508) and presence of CL (P = 0.293) did not affect conception rate. Season of year at calving (P = 0.256), DIM (P = 0.215) and presence of CL (P = 0.076) also did not influence estrous return detection rate. Season of year at the moment of TAI did not interfere with conception rate (P = 0.236); however, there was an affect (P = 0.012) on estrous return detection rate; values found in spring-summer were lower than in autumn-winter (38.24% vs. 53.47%).This suggests the detrimental effect of excessive heat on the occurrence of estrous in Holstein cows. Key words: Cattle, reproductive efficiency, estrous return, synchronization ResumoObjetivou-se avaliar a influência da estação do ano no momento do parto e da inseminação, do número de dias pós-parto (DPP) e da presença de corpo lúteo (CL) no início do protocolo hormonal sobre as taxas de concepção e de detecção do estro de retorno em vacas leiteiras Holandesas submetidas à inseminação artificial em tempo fixo (IATF Campos, C. C. ; Santos, R. M. dos gestação foi realizado 32 dias pós-IA por ultrassonografia. As vacas que retornaram ao estro antes do diagnóstico de gestação foram reinseminadas convencionalmente, 12 horas após a detecção do estro. O manejo de observação de estro era realizado por funcionários treinados, duas vezes ao dia, de manhã e à tarde, por aproximadamente 30 minutos. As vacas vazias foram ressincronizadas utilizando o mesmo protocolo. Os dados foram analisados por Regressão Logística no programa Minitab. Adotou-se nível de significância de P < 0,05. Um total de 406 inseminações foram realizadas, que resultaram em 101 gestações com taxa de concepção de 24,87...

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Taxa de gestação em fêmeas da raça Holandesa confinadas em free stall, no verão e inverno

Cited by 20 publications

References 12 publications

Alternative body sites for heat stress measurement in milking cows under tropical conditions and their relationship to the thermal discomfort of the animals

Alternative body sites for heat stress measurement in milking cows under tropical conditions and their relationship to the thermal discomfort of the animals

Comportamento ingestivo e parâmetros fisiológicos de bovinos Sindi alimentados com teores crescentes de feno de erva-sal

Conception rate and estrous return detection after TAI in Holstein cows

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