Avaliação da utilização de narasina na condição e composição corporal, fisiologia e parâmetros produtivos e imunológicos da prole em fêmeas nelore consumindo dietas de alta forragem
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Data
2022-07-13
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Universidade Estadual Paulista (Unesp)
Resumo
Oitenta e oito novilhas nelore prenhes do mesmo touro foram alojadas em duplas a partir dos 104 dias pré-parto em baias até a desmama, distribuídas em dois grupos, recebendo 0,26 mg de narasina/ kg de peso vivo diariamente misturado a um suplemento proteico-energético (ZIM) ou apenas o suplemento sem narasina (CON). Os animais tiveram acesso a feno e água ad libitum. Antes do início dom estudo foram coletadas amostras de pelo da cauda para análise genômica. Nos dias -104, -74, -44 0 (parto), 30, 58, 100, 141 171 e 212 foi coletado ECC, peso, velocidade de saída de tronco (com exceção do D0) das matrizes. Nos dias -44, 0 e 30, foi coletado sangue das matrizes para análise da concentração de IGF-1 plasmático. Nos dias -104, -44, 58, 100, 141 e 212 foram coletados dados corporais das matrizes utilizando ultrassonografia de carcaça. Dos bezerros foi coletada uma amostra de sangue 24 a 36 horas após o parto para avaliação de proteína sérica total e concentração de IgG, além de peso de nascimento. Nos dias 30, 58, 100, 141, 171 e 212 foi coletado peso de todos os bezerros. Casos de doença foram registrados para posterior análise. Mensalmente foi feita uma mensuração do consumo de MS de cada baia por um período de 4 dias seguidos. Vacas do grupo ZIM perderam menos peso (p = 0,04) e apresentaram maior IGF-1 (p < 0,05) no período pré-parto. Não houve diferença entre as demais variáveis de peso, ECC e carcaça, temperamento e consumo de matéria seca. Os bezerros do grupo ZIM apresentaram maior proteína sérica total (p = 0,03) e tendência para maior IgG (p = 0,10). Houve menos casos de doença por bezerro no grupo ZIM (p = 0,03). Na avaliação de peso dos bezerros, houve interação tratamento x dia, com o grupo ZIM apresentando tendência (p = 0,09) para maior ganho de peso nas últimas 3 avaliações do estudo (p < 0,05). O uso de narasina foi eficiente em impactar nos resultados, portanto seu uso pode ser benéfico em sistemas de cria.
Eighty-eight heifers, pregnant from the same bull, were housed in pens, divided in pairs, from 134 days pre-parturition until weaning. The pens were distributed into two groups, one of them was fed 0,26 mg of narasin per kg of live weight mixed in a protein-energetic supplement (ZIM) as the other group was just fed with the supplemet without narasin (CON). All the animals had ad libitum access to hay and drinking water. Before the iniciation of the study, tale hair samples were collected for genomic analysis. On days -104, -74, -44, 0 (parturition), 30, 58, 100, 141, 171 and 212, BCS, body weight, chute exit speed, (except for D0) were collected from dams. On days -44, 0 and 30, blood samples were taken from dams for plasma IGF-1 analysis. On days -104, -44, 58, 100, 141 and 212, body parameters were collected by carcass ultrassonography. Birth weight and a blood sample was collected from calves about 24 to 36 hours after parturition for seric protein and IgG concentrations. On days 30, 58, 100, 141, 171 and 212 body weight was collected from calves. Sickness ocurrence was recorded for further analysis. Monthly, dry matter intake from each pen was measured for 4 consecutive days. ZIM cows lost less weight (p = 0,04) on the pre-parturition period and had higher IGF-1 (p < 0,05). There were no diferences in post-parturition body weight, BCS, carcass, temperament and dry matter intake variables. ZIM calves had less ocurrence of sickness per calf. In calf ADG, there was a treatment x day interaction, with ZIM calves having a higher ADG on the three last evaluations (p=0,10). The use of narasin was efficient on impacting the results, so its use may be advantageous on cow-calf operations.
Eighty-eight heifers, pregnant from the same bull, were housed in pens, divided in pairs, from 134 days pre-parturition until weaning. The pens were distributed into two groups, one of them was fed 0,26 mg of narasin per kg of live weight mixed in a protein-energetic supplement (ZIM) as the other group was just fed with the supplemet without narasin (CON). All the animals had ad libitum access to hay and drinking water. Before the iniciation of the study, tale hair samples were collected for genomic analysis. On days -104, -74, -44, 0 (parturition), 30, 58, 100, 141, 171 and 212, BCS, body weight, chute exit speed, (except for D0) were collected from dams. On days -44, 0 and 30, blood samples were taken from dams for plasma IGF-1 analysis. On days -104, -44, 58, 100, 141 and 212, body parameters were collected by carcass ultrassonography. Birth weight and a blood sample was collected from calves about 24 to 36 hours after parturition for seric protein and IgG concentrations. On days 30, 58, 100, 141, 171 and 212 body weight was collected from calves. Sickness ocurrence was recorded for further analysis. Monthly, dry matter intake from each pen was measured for 4 consecutive days. ZIM cows lost less weight (p = 0,04) on the pre-parturition period and had higher IGF-1 (p < 0,05). There were no diferences in post-parturition body weight, BCS, carcass, temperament and dry matter intake variables. ZIM calves had less ocurrence of sickness per calf. In calf ADG, there was a treatment x day interaction, with ZIM calves having a higher ADG on the three last evaluations (p=0,10). The use of narasin was efficient on impacting the results, so its use may be advantageous on cow-calf operations.
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Palavras-chave
Narasina, Vaca, Bezerro, Nutrição, Narasin, Cow, Calf, Nutrition