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Comportamento reprodutivo de vacas de corte manejadas em pastagem natural com duas cargas animais e duas idades à desmama Translated title: Reproductive performance of beef cows maintained at two stocking rates and two ages of weaning on natural pasture

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      Abstract

      Este trabalho foi realizado para avaliar o desempenho produtivo e reprodutivo de 52 vacas de corte mestiças Charolês × Nelore em pastagem natural. O experimento foi iniciado em 4/8/2003, quando as vacas em gestação foram distribuídas uniformemente por peso e condição corporal em duas cargas animais (280 e 360 kg PV/ha). O desmame precoce foi realizado em 26 vacas quando os bezerros(as) atingiram em média 100 dias de idade e o desmame convencional, em 26 vacas quando os bezerros(as) atingiram em média 180 dias de idade. As vacas submetidas ao desmame precoce tiveram maior ganho médio diário em comparação àquelas submetidas ao desmame convencional (0,471 vs. 0,255 kg/dia, respectivamente). Houve interação significativa entre as idades de desmame e os períodos para a condição corporal das vacas. As vacas submetidas ao desmame precoce apresentaram melhor condição corporal na época do desmame convencional (3,5 vs. 2,8) e ao final do acasalamento (3,0 vs. 2,8). A carga animal não afetou significativamente o ganho médio diário nem a condição corporal das vacas. A taxa de prenhez das vacas do desmame precoce (60,0%) foi significativamente superior à do desmame convencional (12,0%), no entanto, as cargas animais não diferiram entre si (7,7% vs. 15,4%, respectivamente). Nos bezerros submetidos ao desmame precoce, o ganho médio diário e o peso vivo aos 180 dias foram significativamente inferiores aos observados nos bezerros do desmame convencional. O manejo da pastagem com as duas cargas animais no pós-parto das vacas e as duas idades de desmame dos bezerros não influenciam o peso médio e o ganho médio diário dos bezerros até os 14 meses de idade.

      Translated abstract

      The study was conducted to evaluate productive and reproductive performance of 52 crossbred Charolais × Nellore beef cows on natural pasture. The experiment started on August 04, 2003, when pregnant cows were uniformly distributed by weight and body condition at two stocking rates (CA280 = 280 kg LW/ha and CA360 = 360 kg LW/ha). Early weaning was imposed to 26 cows when calves reached average of 100 days of age and conventional weaning, when calves were approximately 180 days old. Cows submitted to early weaning had average daily gain higher than cows submitted to conventional weaning (0.539 vs. 0.257 kg/day, respectively). There was significant interaction between weaning ages and periods for body condition of cows. Cows submitted to early weaning presented higher body condition at conventional weaning (3.5 vs. 2.8) and at the end of mating period (3.0 vs. 2.8) than the conventional weaning. The stocking rate did not significantly affect the average daily gain and body condition of cows (CA280 = 0.101 kg/day, 2.7 and CA360 = 0.214 kg/day, 2.7, respectively). The pregnancy rate of cows under early weaning (60.0%) was significantly better than for those under conventional weaning (12.0%); however, the stocking rates did not differ (CA280 = 7.7% vs. CA360 = 15.4%). In calves submitted to early weaning, average daily gain and live weight at 180 days were significantly lower than those of calves at conventional weaning. The post-partum management of cows and two ages of weaning calves evaluated did not affect the development of calves until 14 months of age.

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      Most cited references 30

      • Record: found
      • Abstract: not found
      • Article: not found

      Manejo nutritivo de los rodeos de cría en pastoreo

        Bookmark
        • Record: found
        • Abstract: not found
        • Article: not found

        Reproducción y manejo de los rodeos de cria

         J. ROVIRA,  J Rovira (1974)
          Bookmark
          • Record: found
          • Abstract: not found
          • Article: not found

          Nutrition and the development of replacement heifers

           L Rice (1991)
            Bookmark

            Author and article information

            Affiliations
            [1 ] Universidade Federal do Rio Grande do Sul Brazil
            [2 ] Universidade Federal de Santa Maria Brazil
            Contributors
            Role: ND
            Role: ND
            Journal
            rbz
            Revista Brasileira de Zootecnia
            R. Bras. Zootec.
            Sociedade Brasileira de Zootecnia (Viçosa )
            1806-9290
            November 2011
            : 40
            : 11
            : 2606-2612
            S1516-35982011001100044 10.1590/S1516-35982011001100044

            http://creativecommons.org/licenses/by/4.0/

            Product
            Product Information: SciELO Brazil
            Categories
            AGRICULTURE, DAIRY & ANIMAL SCIENCE
            VETERINARY SCIENCES

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