Desempenho, características da carcaça, perfil de ácidos graxos e parâmetros ruminais de ovinos alimentados com rações contendo polpa cítrica úmida semi despectinada e/ou polpa cítrica desidratada / Performance, carcass characteristics, fatty acids profile and ruminal measures in sheep fed diets containing wet low pectin citrus pulp and/or dried citrus pulp

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The objective of this study was to evaluate the performance, fatty acids (FA) profile and ruminal measures of sheep fed citrus coproducts in diets containing high concentrate. Additionally, the performance and metabolic estimates from SRNS model - Small Ruminant Nutrition System were compared to experimental data. In Experiment I, 28 ewes were fed diet containing 55% of corn. Dried citrus pulp (DCP) was added at 18.1, 36.8 and 55% (diet DM) replacing corn by 33, 67 and 100%, respectively. There was a linear decrease (P<0.02) in dry matter intake (DMI) with DCP inclusion, however, there was no effect on milk production. Milk composition, was not affected by DCP inclusion, except for urea that showed a linear (P<0.01) decrease. Milk FA increased linearly for C15:0, C16:0, C17:1, C18:3, medium-chain and saturated FA and decreased linearly for C18:0, C18:1, C18:2 t10,c12, monounsaturated and long-chain FA when DCP replaced corn. There was a 47% increase for C18:2 c9,t11 when DCP replaced corn by 33%. In Experiment II, 32 Santa Ines lambs were fed a 90% concentrate. DCP was added at 23.7, 46.1 and 68.4% (on a DM basis) replacing corn by 33, 67 and 100%, respectively. Total replacement of corn by DCP promoted an increase (P<0.03) by 177% in linolenic acid (C18:3) while a partial replacement showed an increase (P<0.02) by 72% in conjugated linoleic acid (C18:2 c9,t11). In addition, ether extract decrease (P=0.02) as DCP increased in the diet. In Experiment III, 64 lambs were fed diets containing 69.5% DCP. A portion (30%) of DCP on a DM basis was replaced by wet low pectin citrus pulp (WLPCP), wet low pectin citrus pulp silage (WLPCPS) or wet low pectin citrus pulp silage with sodium benzoate (WLPCPS+B). There were no differences in DMI and average daily gain (ADG). However, feed efficiency was greater for lambs fed WLPCP compared to lambs fed DCP. In the digestibility trial, 16 lambs, canulated in the rumen, were fed diets containing 75.3% DCP. A portion (30%) of the DCP was replaced by WLPCP, WLPCPS or WLPCPS+B. There was no difference (P>0.05) in dry matter, organic matter and crude protein apparent digestibilities, except for neutral detergent fiber digestibility (82.7 vs 73.3% for WLPCP and DCP, respectively). Additionally, ruminal ammonia concentration was higher (P<0.01) in diets containing DCP compared to WLPCPS and WLPCPS+B. In experiment IV, 24 Santa Ines lambs were fed diets containing 70% DCP and monoammonium phosphate (MAP) was added at 0, 0.3, 0.6, and 0.9% of the diet DM There was a linear decrease (P<0.01) in DMI and ADG. In experiment V DMI predictions were better estimated for lambs compared to DMI of ewes.

ASSUNTO(S)

Ácidos graxos rúmen carnes e derivados rumen sheep. milk subprodutos para animais. fatty acids ovinos by-products for animals meat and meat products leite animal feeding alimentação animal

ACESSO AO ARTIGO

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