Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/1655
Título: Efeito da suplementação com Lupinus albus no período pré-cobrição sobre o estado nutricional e a taxa de concepção de ovelhas Merino Branco em condição corporal estável ou crescente
Autor: Jorge, Sara Alexandra Pinto
Orientador: Gonçalves, Sandra Cavaco
Caldeira, Rui Manuel Vasconcelos e Horta
Palavras-chave: ewe
reproductive efficiency
nutritional status
body condition
blood metabolites
Data de Defesa: 2009
Resumo: Nutrition plays an important role in reproduction and is very used in the reproductive manipulation of farm animals. The lupin seed (Lupinus spp.), a grain legume with high energy and protein content, has been extensively used as a supplement to improve the reproductive efficiency of sheep. In this work it was studied the effect of Lupinus albus supplementation of Merino Branco ewes on some metabolic blood metabolites (non esterified fatty acids, glucose, urea and albumin) in order to assess the nutritional status of ewes, and on some reproductive parameters (the interval between the removal of the sponges and the beginning of oestrus and the conception rate). For these studies four groups of fifteen animals each had been formed: group 1C (increasing body condition, control diet), group 1T (increasing body condition, diet with lupin), group 2C (steady body condition, control diet), group 2T (steady body condition, diet with lupin). Estrous was synchronized on all ewes using intravaginal progestagen impregnated sponges which remaining in situ for 6 days (D0-D6). On the day before sponges were removed prostaglandin F2α was administered. Control diets and diets with lupin were given from D1 to D6. Diets of groups 1T and 1C had equal amounts of protein and energy, and also diets of groups 2T and 2C. On D7 and on D8 rams were introduced to detect ewes in estrous and mate them. Body condition score (BCS) was evaluated on D-1, 6 and 28, and live weight (LW) was evaluated on D-1, 14 and 28. Progesterone was measured on blood samples taken on D6, 7, 8, 14 and 25. The above refered metabolic metabolites were measured on samples collected on D-3, 2, 4, 6 and 14. The estrus synchronization protocol used was efficient and oestrus occurred within the normal time range in all animals. The pregnancy rate was lower in animals of group 2T, having animals in increasing body condition (groups 1T and 1C) better results, showing a positive effect of nutritional status. All animals consumed the total amount of feed offered, with the exception of those belonging to group 2T, which had a reduced feed intake at the beginning of the supplementation period. This reduction might be due to the high content of alkaloids present at the lupin seed used. The BCS increased between D-1 and D6 in animals of group 1T. The LW increased between D6 and D28 in animals of group 1C. This lack of improvement of BCS and LW observed in animals of group 2T, after a short-term lupin supplementation period, has already been refered by several authors. The results of non esterified fatty acids, glucose, urea and albumin have showed that the nutritional status of the animals was balanced in all groups, being all animals in a positiveenergy balance. Nevertheless, group 2T had significantly higher concentrations of non esterified fatty acids at the beginning of the supplementation period, which might be due to the reduction of the feed intake observed, which lead to the mobilization of fat reserves. The analysis between groups did not detect any differences in the concentrations of glucose nor albumin. Group 1C had higher urea concentration in D6 than group1T and 2T. This suggests a better utilization of protein in animals from groups receiving lupin, showing a better balance between protein and energy content of lupin or a better protein quality of this seed.
Descrição: Mestrado em Engenharia Zootécnica - Produção Animal - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/1655
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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