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Effect of herbal mixture in beef cattle diets on fattening performance and nutrient digestibility. The aim of the study was to evaluate the impact of herbal mixtureaddition in beef cattle diet on daily weight gain, feed utilization and the nutrient digestibility. The study was performed on 16 Limousin bulls during the fattening period from 100 kg to 650 kg of body weight. The animals were divided into two groups: a control (C) and experimental (E) group. All experimental bulls received the same daily rations composed of basal feeds and a concentrate mixture. The experimental factor was a certified mixture of dried chopped herbs (the author's own elaboration): Echinacea (Echinacea purpurea Moench.), garlic (Allium sativum L.), thyme (Thymus vulgaris), caraway (Carum carvi), and liquorice(Glycyrrhiza glabra), given additionally to the rations, in the amount of 3% of the predicted daily dry matter intake. During the study, the feed intake, animal weight gain, feed utilization per 1 kg of body weight gain, and nutrient digestibility were determined.The digestibility study was performed with the indicator method using acid-insoluble ash (AIA) as internal indicator. The addition of herbs improved animals’ performance. Higher daily gains in the experimental group of animals (1194 g/day/animal), compared to those fed without the addition of herbs (982 g/day/animal), were found with simultaneous better feed utilization for 1kg of growth (5.01 kg in the experimental group, 5.94 kg in the control group). Higher apparent protein and fat digestibility coefficients were noted in the animals from the experimental group (by 1.3 and 2.5 percentage points, respectively), compared to the control ones. In conclusion at least a 3% addition of herbal mixture containing Echinacea, garlic, thyme, caraway,and liquoricecan be recommended in beef cattle diet in order to improve thefattening performance. The addition of herbs improves animals’ performance. Higher daily gains in the experimental group of animals, with simultaneous better utilization of feed per1 kgof growth, were found.
A literature search shows that robust techniques are rarely used in the animal sciences. Traditionally,normal theory tests are used to determine whether there are significant differences among group means. However, normal theory tests are optimal only if the distribution of error terms is normal and in practice, non-normal distributions are more prevalent. Therefore, in this study, it is aimed to present robust tests based on modified maximum likelihood (MML) estimators for testing the equality of the group means. A real data set about the effect of zeolite and initial weight on feedlot performance of Brown Swiss cattle is the subject of the study. Results showed that the test statistics presented in this study are more powerful than the traditional normal-theory tests. They are also more robust against departures from assumed distribution and outliers.
Crossbred (F1) Booroola × Olkuska ewe-lambs were randomly assigned to control (C, n=8) and experimental (E, n=9) group with initial mean body weight of 7.6 and 7.3 kg, respectively, and fattened up to the mean live body weight of 24 kg. Lambs from both groups were fed ad lib. The concentrate mix containing 207 g crude protein and 12.5 MJ metabolizable energy per kg dry master of feed. During fattening each lamb from group E was administered per os with 3 g of lineseed oil and 3 g mineral bioplex daily. The lambs were slaughtered at the live weight of 22.8 (group C) and 24.2 (group E) kg. No significant differences between groups were found in mean daily live Wright gain (111 and 125 g in C and E lambs, respectively). Concentration of blood plasma cholesterol and its fractions did not differ significantly between groups. Dressing percentage, valuable cuts and perirenal fat contents of right carcass side (42.05%, 42.20%, and 2.65% in C vs. 43.13%, 42.38% and 3.04% in E lambs, respectively) were similar in groups. The supplements applied (group E) did not significantly influence dry matter, protein and fat content of longissimus dorsi muscle, but significantly (P≤0.002) altered its cholesterol level (group C – 60.47, group E – 75.56 mg/100 g tissue).The fatty acid profile of intramuscular fat reflected more favourable meat dietetic value in lambs E compared to lambs C.
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