Efeito do genótipo e do teor protéico da dieta na resistência de cordeiros à hemoncose experimental
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Data
2010-07-15
Autores
Buzzulini, Carolina [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Este trabalho objetivou avaliar o efeito do genótipo e da dieta protéica na resistência e no desempenho de cordeiros experimentalmente infectados por Haemonchus contortus. Foram utilizados 24 cordeiros provenientes do cruzamento das raças Dorper x Santa Inês (DSI) e 24 Santa Inês (SI), isentos de nematódeos gastrintestinais, distribuídos em quatro grupos de seis animais. De acordo com o genótipo, os cordeiros foram subdivididos em dois grupos infectados e dois mantidos como controle, recebendo dieta com menor teor (12%) e maior teor de proteína bruta (20%), respectivamente. Os cordeiros infectados artificialmente receberam um inóculo contendo 1.000 larvas infectantes (L3) de H. contortus por dose, duas vezes por semana, durante todo o experimento. Os cordeiros foram mantidos em baias individuais, com controle diário do alimento fornecido e de sobras. Semanalmente, foram realizadas contagens de ovos de nematódeos por grama de fezes (OPG), hemograma, dosagens bioquímicas, além de pesagens individuais. Ao atingirem 35 kg de peso corporal, os cordeiros foram abatidos e necropsiados, objetivando mensurar a carga parasitária, avaliar as características quantitativas das carcaças e qualitativas da carne. O desempenho (consumo de matéria seca, ganho de peso diário, conversão alimentar e eficiência alimentar) foi superior (P<0,05) para o genótipo DSI, para a dieta com teor mais elevado de proteína e para os cordeiros mantidos sem infecção por H. contortus. O efeito do genótipo, da suplementação protéica e da hemoncose também influenciou as principais variáveis hematológicas e bioquímicas, cujos valores foram menores em cordeiros infectados e mantidos com alimentação menos protéica. Contagens médias superiores (P<0,05) de OPG (520,06) e H. contortus (200,38) foram observadas no genótipo DSI. Observou-se influência do genótipo DSI (P<0,05) nos pesos médios...
This work aimed to evaluate the effect of genotype and dietary protein on the resistance and performance of lambs to experimentally infected by Haemonchus contortus. Twenty-four Dorper x Santa Inês (DSI) crossbreed lambs and 24 pure Santa Inês (SI), without gastrointestinal nematodes, were distributed into four groups of six lambs. Within each genotype, the lambs were subdivided into two infected and two control groups, which received a low protein (12%) or high protein diet (20%), respectively. The experimentally infected lambs received inoculate containing 1,000 infecting larvae (L3) of H. contortus per dose, twice weekly, throughout the entire experimental period. The lambs were maintained in individual stalls, with daily control of feed provided and remaining. Weekly, nematode egg per gram of feces (EPG) counts were performed, together with hemograms, biochemical concentrations and individual weighing. Once they achieved 35 kg, the lambs were slaughtered and necropsied to determine the parasite load and evaluate the quantitative characteristics of the carcass and the qualitative characteristics of the meat. For the DSI genotype, the performance (dry material consumption, daily weight gain, feed conversion and feed efficiency) was greater (P<0.05) for the diet containing higher protein content and for lambs not infected by H. contortus. The effect of genotype, dietary protein content and parasitic condition also influenced the principal hematological and biochemical variables, showing lower values in infected lambs and those fed with low protein feed. The highest mean EPG (520.06) and H. contortus (200.38) counts were observed in the DSI genotype (P<0.05). Observation verified the influence of the DSI genotype (P<0.05) on the mean warm and (17.03 kg) cold (16.48 kg) carcass weights and of H. contortus infection on weight-loss due to cooling (6.2%) ...(Complete abstract click electronic access below)
This work aimed to evaluate the effect of genotype and dietary protein on the resistance and performance of lambs to experimentally infected by Haemonchus contortus. Twenty-four Dorper x Santa Inês (DSI) crossbreed lambs and 24 pure Santa Inês (SI), without gastrointestinal nematodes, were distributed into four groups of six lambs. Within each genotype, the lambs were subdivided into two infected and two control groups, which received a low protein (12%) or high protein diet (20%), respectively. The experimentally infected lambs received inoculate containing 1,000 infecting larvae (L3) of H. contortus per dose, twice weekly, throughout the entire experimental period. The lambs were maintained in individual stalls, with daily control of feed provided and remaining. Weekly, nematode egg per gram of feces (EPG) counts were performed, together with hemograms, biochemical concentrations and individual weighing. Once they achieved 35 kg, the lambs were slaughtered and necropsied to determine the parasite load and evaluate the quantitative characteristics of the carcass and the qualitative characteristics of the meat. For the DSI genotype, the performance (dry material consumption, daily weight gain, feed conversion and feed efficiency) was greater (P<0.05) for the diet containing higher protein content and for lambs not infected by H. contortus. The effect of genotype, dietary protein content and parasitic condition also influenced the principal hematological and biochemical variables, showing lower values in infected lambs and those fed with low protein feed. The highest mean EPG (520.06) and H. contortus (200.38) counts were observed in the DSI genotype (P<0.05). Observation verified the influence of the DSI genotype (P<0.05) on the mean warm and (17.03 kg) cold (16.48 kg) carcass weights and of H. contortus infection on weight-loss due to cooling (6.2%) ...(Complete abstract click electronic access below)
Descrição
Palavras-chave
Haemonchus contortus, Proteínas, Santa Inês (Raça de ovino), Dorper, Haemonchus contortus, Protein, Santa Inês, Dorper
Como citar
BUZZULINI, Carolina. Efeito do genótipo e do teor protéico da dieta na resistência de cordeiros à hemoncose experimental. 2010. ii, 128 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2010.