Eficiência produtiva em vacas primíparas das raças Aberdeen Angus e Charolês

Ribeiro, Edson Luís de Azambuja; Restle, João; Rocha, Marcelo Peres; Mizubuti, Ivone Yurika; Silva, Leandro das Dôres Ferreira da

doi:10.1590/s1516-35982001000100019

Cited by 25 publications

(47 citation statements)

References 9 publications

(19 reference statements)

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“…As primíparas aos 22/24 meses mantidos com dietas de média qualidade no pós-parto perderam 0,26 ponto de condição corporal durante 45 dias, ao passo que aquelas mantidas com dieta de alta qualidade tiveram ganho de condição corporal de 0,45 ponto na escala de 1 a 9 pontos (Ciccioli et al, 2003). Com maior nível nutricional no pós-parto, Ribeiro et al (2001) perceberam maior produção de leite, bezerros mais pesados ao desmame e maior produtividade dos rebanhos de cria.…”

Section: Resultsunclassified

“…As estimativas das medidas de eficiência produtiva foram obtidas por meio das características quantificadas, conforme metodologia descrita por Ribeiro et al (2001). A primeira estimativa de eficiência foi considerada a quantidade de kg de bezerros ao final do período reprodutivo para cada 100 kg de vacas paridas: EPVP = (P100/PVP)*100, em que EPVP = eficiência produtiva ao parto; P100 = peso do bezerro ajustado aos 100 dias de idade; e PVP = peso da vaca ao parto.…”

Section: Methodsunclassified

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Desenvolvimento e desempenho reprodutivo de vacas primíparas aos 22/24 meses de idade

Pilau

Lobato

2009

R. Bras. Zootec.

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Reproductive performance of primiparous cows at 22/24 months of age ABSTRACT -The objective of this work was to evaluate the feed systems for 70 primiparous beef heifers from the initial gestation period at the age of 13/15 months to the end of the second reproductive period as primiparous cows at 22/24 months of age. The experimental design was fully random with plots subdivided in time considering animals as replicates.The initial mean live weigh was 282 kg and the initial mean body condition was 3.2. The feeding systems were proposed to obtain higher live weight gain at initial (PCIG) or final (PCFG) gestation period: PCIG -pregnant heifers on pearl millet pasture (Pennisetum americanum, L.) during the initial gestation period and on natural pasture at pre-calving period; PCFGpregnant heifers on natural pasture during the initial gestation period and on oat (Avena strigosa Schreb) and annual ryegrass (Lolium multiflorum Lam) pasture at pre-calving period. At initial gestation period, the mean live weight gain of 0.424 kg of PCIG heifers was higher than 0.245 kg of PCFG heifers. In the pre-calving period, PCIG heifers lost weight, 0.303 kg/day and presented BC of 0.77, while PCFG heifers gained 0.901 kg/day and presented BC of 0.37. The weight of 323 kg and body condition of 3.3 of post-calving PCFG heifers were higher than 274 kg and BC of 2.6 of PCIG heifers, respectively. PCFG heifers had calves 4 kg heavier. In the beginning of the second reproduction period, PCFG cows were 35 kg heavier and presented BC of 0.60. The pregnancy rate of 85% of PCFG heifers was higher than 53% of PCIG heifers.Pregnant cows had the highest body condition rate at calving and at the beginning of the second reproduction period, presented higher calving and mating interval and heavier calves.Key Words: body condition, dystocia, calving, live weight, grazing systems IntroduçãoO número de bezerros desmamados em relação ao número de fêmeas do rebanho é fator determinante, direto ou indireto, da rentabilidade na atividade pecuária do Brasil. Altos índices reprodutivos possibilitam ocupar áreas destinadas a vacas não-gestantes e novilhas em crescimento com categorias produtivas, basicamente R. Bras.

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Section: Resultsunclassified

Section: Methodsunclassified

Desenvolvimento e desempenho reprodutivo de vacas primíparas aos 22/24 meses de idade

Pilau

Lobato

2009

R. Bras. Zootec.

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“…T h e d e v e l o p m e n t o f b e e f c o w s a n d t h e i r reproductive performance are affected by management practices, health care, and nutritional levels to which they are submitted, which are clearly seen in southern Brazil, where most beef cattle operations are based on native pastures, the main nutritional source of those herds (Restle et al, 2001). …”

Section: Introductionmentioning

confidence: 99%

Effects of the weaning age of calves on somatic development and on reproductive performance of beef cows

Vaz

Lobato

2010

R. Bras. Zootec.

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-This study evaluated body development and reproductive performance of beef cows whose calves were submitted to early weaning (76 days of age), or conventional weaning (148 days of age). It was used 141 Braford cows that calved in 2004, 2005, and 2006 to evaluate weight at calving at 76 days, weight at calving at 148 days, weight at the beginning and end of the breeding season, variation of the average daily weight, body condition, pregnancy rate, and calving interval.Dams of calves weaned at 148 days of age showed daily weight gain higher body weight and better body condition at 148 days of age. The weights at the end of breeding season and average weight gain during the breeding season were higher in early weaning cows than in conventional cows. Pregnancy rate of early weaning cows (86.34%) was higher than those submitted to weaning at conventional age (55.45%). Pasture interval was similar among early weaning cows and conventional weaning cows. The best benefit on reducing weaning age in pregnancy rate was in primiparous cows. There was significant interaction between weaning age and the year for calving interval and milk production. The early weaning of calves carried out at 76 days of age allows cows to better weight recovery in the post-weaning and breeding periods, improving their body condition and consequently increasing pregnancy rate regarding to cows whose calves suckled until 148 days of age.

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“…Lighter cows were more efficient in calf production at calving and at weaning, as compared to heavier cows, by 14.96 and 14.38%, respectively. Better results for smaller cows indicate that the outcomes are associated with the compatible performances of the calves that displayed better productivity (EUCLIDES FILHO et al, 1995;RIBEIRO et al, 2001). Animals with a smaller body size typically have greater production in kilogram of weight of calves in relation to weight of cows, both at calving and at weaning .…”

Section: Resultsmentioning

confidence: 99%

“…The productive efficiencies of the cows of different sizes at calving (PEC) and weaning (PEW) were evaluated according to the methodology described by RIBEIRO et al (2001). The estimates were considered in relation to the amount (kg) of calves weaned for every 100 kg of cows calved: PEC = (C a WW/C o WC)*100; and for every 100 kg of cow with weaned calf: PEW = (C a WW/ C o WW)*100, where C a WW is the calf weight at weaning, at 235 days of age.…”

Section: Methodsmentioning

confidence: 99%

Productive efficiency of cows primiparous aberdeen angus of the body size and milk production levels

Vaz¹,

Ribeiro²,

Restle³

et al. 2016

Biosci. J.

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Assessment of the productive efficiency of 30 primiparous Aberdeen Angus cows of different body sizes, classified at calving as heavy (375±10.5 kg) or light (283±7.7 kg), and different total milk-yield levels, classified as high (868±24.5 kg) or low (547±18.3 kg). Heavy cows were superior in weight at calving and weaning, but there were no differences in milk yield and weight at birth and weaning of calves. Heavy cows were less efficient than light cows in the production of kilograms of calves per 100 kg of cows at calving and at weaning. High milk producing cows were heavier at calving and had heavier calves at birth and weaning, but did not differ between the milk-yield levels for the variation in daily weight. The variation in daily weight of the calves was greater from high-producing cows. High milk producing dairy beef cows were more efficient at weaning, and their calves required less milk to produce one kilogram of live weight.

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Eficiência produtiva em vacas primíparas das raças Aberdeen Angus e Charolês

Cited by 25 publications

References 9 publications

Desenvolvimento e desempenho reprodutivo de vacas primíparas aos 22/24 meses de idade

Desenvolvimento e desempenho reprodutivo de vacas primíparas aos 22/24 meses de idade

Effects of the weaning age of calves on somatic development and on reproductive performance of beef cows

Productive efficiency of cows primiparous aberdeen angus of the body size and milk production levels

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