Impactos de variáveis climáticas na agilidade de bezerros Nelore neonatos

Toledo, Luciandra Macedo de; Costa, Mateus José Rodrigues Paranhos da; Titto, Evaldo Antônio Lencioni; Figueiredo, Leopoldo de Andrade; Ablas, Denise de Souza

doi:10.1590/s0103-84782007000500028

Cited by 8 publications

(9 citation statements)

References 3 publications

(2 reference statements)

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“…Weather conditions (Toledo et al. 2007), calf weight at birth, udder shape and teat size (Ventrop and Michanek 1992) are other identified factors that would result in fail or delay in the first suckling.…”

Section: The Importance Of the Behavioural Studies To Increase Reprodsupporting

confidence: 88%

Mother–Offspring Interactions in Zebu Cattle

Costa

Shet

Toledo³

2008

Reprod Domestic Animals

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The knowledge of the interaction between mother and offspring might contribute to enhance the welfare of the offspring and to improve the reproductive efficiency of the cow. However, there is still little information available about such interaction in some cattle breeds. A series of observational studies were set up, addressing the mother-offspring relationships of Nelore, Guzerat and Gyr cattle breeds. Firstly, the behaviour of cows and calves around the time of parturition was described, and then, the underlying factors that affect the calves' survival and development were studied. Special attention was given to the failure or delay in the first suckling. The results together are indicative of genetic variability for some studied variables, indicating the possibility of selection for calf vigour (using latency to stand up and latency to suckle as its indicators) and maternal ability (using percentage of time in contact with the calves), in spite of the estimates of heritability were low and presented high standard deviation for all variables. The individual variability in their suckling behaviour and the efficiency in first suckling cannot be explained by a single isolated underlying factor. By now, there are some results available, although there are many questions without answers. The field is still open for the development of future research.

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Section: The Importance Of the Behavioural Studies To Increase Reprodsupporting

confidence: 88%

Mother–Offspring Interactions in Zebu Cattle

Costa

Shet

Toledo³

2008

Reprod Domestic Animals

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“…Passini et al (2009) found that animals kept under thermal stress reduced their total dry matter intake without changing the concentration of calories or fiber in their diets, probably in an attempt to keep a stable ruminal environment. Toledo et al (2007) found a negative correlation between the THI and the maximum value of the time it took neonatal Nellore calves to stand up and breastfeed; calves born when the THI was lower had a latency time to standing up higher than 100 minutes, suggesting that the thermal comfort zone of newborn calves is at higher temperatures.…”

Section: Resultsmentioning

confidence: 91%

<b>Environmental effects on reproductive performance of Nellore cows widely raised in the Cerrado/Pantanal ecotone

Oliveira

Rezende

Abreu

et al. 2015

Acta Sci. Anim. Sci.

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We analyzed the pregnancy rate (PR) and birth rate (BR) of Nellore cows raised extensively in the Cerrado/Pantanal during 4 mating seasons (2009)(2010)(2011)(2012), assessing the relationship with the temperature and humidity index (THI) and the effect of the year and breeding season. We used information from 2,116 cows, which were categorized as either multiparous (n = 1430), primiparous (n = 338), or nulliparous (n = 348). In the months of the breeding season (December-February), temperature and relative humidity data were collected to calculate the temperature and humidity index (THI). An ANOVA was performed with a model that included sources of variation from the fixed effects of category of cow and year on PR and BR; and a linear regression analysis and correlation between THI and PR and BR. We observed a significant effect (p < 0.05) on PR. We classified the average across breeding seasons as a moderate THI. The THI of the breeding seasons showed high and significant (p < 0.05) effects only on the nulliparous BR, and low values in other categories. It is concluded that the seasonal THI was not related to the performance of cows, except BR in nulliparous cows.Keywords: beef cattle, environmental effect, reproductive efficiency.Interação do ambiente com desempenho reprodutivo de matrizes Nelores criadas extensivamente no ecótono Cerrado/Pantanal RESUMO. Analisou-se taxa de prenhez (TP) e de natalidade (TN) de matrizes Nelores criadas extensivamente no Cerrado/Pantanal, acasaladas durante 4 estações de monta natural (2009 a 2012), avaliando relação com índice de temperatura e umidade (ITU) e efeito do ano da estação de monta. Utilizaram-se 2.116 informações de matrizes, pertencentes às categorias de multíparas (n = 1430), primíparas (n = 338) e nulíparas (n = 348). Nos meses de estação de monta (dezembro a fevereiro) coletaram-se informações da temperatura e umidade relativa do ar, para o cálculo de índice de temperatura e umidade (ITU). Realizaram-se análise de variância com um modelo contendo como fontes de variação os efeitos fixos de categoria e ano de estação de monta sob a TP e TN; e análise da regressão linear e correlação entre o ITU e a TP e TN. Observaram-se efeito significativo (p < 0,05) de categoria sob a TP. Classificou-se o ITU médio entre as estações de monta como moderado. O ITU das estações de monta apresentou relação alta e significativa (p < 0,05) apenas na TN das nulíparas, e baixas tendências de relação com as demais. Conclui-se que o ano da estação de monta e o ITU não apresentaram relação com desempenho das matrizes, exceto as nulíparas considerando ITU e TN. Palavras-chave: bovino de corte, efeito ambiental, eficiência reprodutiva.

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“…To avoid the contamination of newborns with bacteria present in the maternity, the shortest time possible in this location is recommended. However, there are studies that show positive effects based on the interaction between the cow and her calf during the first hours of life of the newborn (Paranhos da Toledo et al, 2007). Moreover, contact between the handler and the calf R. Bras.…”

Section: Resultsmentioning

confidence: 99%

A survey of dairy calf management practices in some producing regions in Brazil

Santos

Bittar

2015

R. Bras. Zootec.

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-This study aimed to characterize the Brazilian dairy calves raising systems through a survey of major aspects of animal husbandry. One hundred seventy-nine producers and/or technicians were interviewed. The questionnaire addressed issues related to the management of the dry cow and the newborn, nutritional management of the liquid-feeding phase, housing, and health management. A third of newborn calves stay with their mothers for more than 24 h after delivery, and only 56% of the calves receive colostrum within the first 8 h of life. Four out of ten producers allow the calf to suckle colostrum directly from the mother. Regarding the liquid diet, 44 and 35% of the farms provide marketable milk and discard milk for the calves, respectively. It was possible to identify several areas of improvement in the raising system; for instance, greater attention could be given to dry cows and the monitoring of births and to the establishment of adequate protocols to evaluate colostrum quality and feeding management.

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Impactos de variáveis climáticas na agilidade de bezerros Nelore neonatos

Abstract: IV

Cited by 8 publications

References 3 publications

Mother–Offspring Interactions in Zebu Cattle

Mother–Offspring Interactions in Zebu Cattle

<b>Environmental effects on reproductive performance of Nellore cows widely raised in the Cerrado/Pantanal ecotone

A survey of dairy calf management practices in some producing regions in Brazil

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