seyed mohammad reza beheshti; kamran rezayazdi; arya badiei; Mostafa Sadeghi
Volume 23, Issue 2 , July 2021, , Pages 213-221
Abstract
The aim of this study was to investigate the effect of different levels of live yeast on ruminal function and health of dairy cows fed diets containing low and high concentrations of non-fiber carbohydrates (NFC). In this experiment, six cannulated dairy cows were randomly assigned in a Latin square ...
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The aim of this study was to investigate the effect of different levels of live yeast on ruminal function and health of dairy cows fed diets containing low and high concentrations of non-fiber carbohydrates (NFC). In this experiment, six cannulated dairy cows were randomly assigned in a Latin square design with six periods (14-days) and six treatments including 1- diet contain low NFC free of live yeast, 2-diet contain low NFC with 5 g/d of live yeast, 3-diet contain low NFC with 10 g/d of live yeast, 4-diet contain high NFC free of live yeast, 5-diet contain high NFC with 5 g/d of live yeast and 6-diet contain high NFC with 10 g/d of live yeast. Dry matter intake, rumination, ruminal parameters and blood metabolites were determined in the different periods. Dry matter intake, rumination activity, nutrient digestibility, mean ruminal pH and temperature were not affected by treatments. General and plasma indicators of animal healthwere also not affected by treatments. Overall, the results of this experiment indicated that dietary supplementation with live yeasthad no significant effect on rumen function and health in cows fed diets containing different concentrations of NFC.
hossein manafi rasi; Ali Bayat; hormoz mansouri
Volume 22, Issue 4 , December 2020, , Pages 549-558
Abstract
To determine the effect of mixed thyme and eucalyptus leaves aqueous’ extract on the performance and health of Holstein suckling calves, an experiment using 32 calves (16 females and 16 males) with 7±3 days old and an average weight of 40.4±3 kg was carried out in a completely randomized ...
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To determine the effect of mixed thyme and eucalyptus leaves aqueous’ extract on the performance and health of Holstein suckling calves, an experiment using 32 calves (16 females and 16 males) with 7±3 days old and an average weight of 40.4±3 kg was carried out in a completely randomized design with four treatments and 8 replicate for 70 days. The treatments were: diets with no extract (control); and diets containing10, 15, and 20 ml of extract (50 % thyme + 50% eucalyptus) in consumed milk. In order to evaluate changes in body weight, chest circumference and height, the data were measured and recorded on days 7, 28, 49, and 70 at 10 a.m. To determine the blood parameters, blood samples were taken from the jugular vein on the 70th days. It turned out that the extract can result in a higher mean body weight gain and larger body size (P <0.05). Moreover, thyme and eucalyptus extracts appeared not to have any effect on digestibility and feed intake, but feed efficiency improved with 20 ml (P <0.05). Fecal and eye secretion index in calves receiving diets containing 15 and 20 ml of extract improved compared to the control group (P <0.05). Also, adding 20 ml of the extract reduced the amount of glucose and increased the number of red blood cells and hematocrit in the blood of the receiving calves compared to other experimental groups. The findings indicated that adding 20 ml eucalyptus and thyme extracts in daily milk, can improve the performance and health of Holstein suckling calves
Mehdi Dehghan banadaky; abolfazl zali
Volume 20, Issue 2 , August 2018, , Pages 283-292
Abstract
To evaluate the effect of feeding yeast probiotic in milk or starter on growth, fecal score, health, blood and rumen parameters, 30 female Holstein calves with average 40.4±1.8 kg birth weight in Taliseh Nemouneh dairy farm used from 14 until 65 days old. Calves randomly divided to 3 treatments ...
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To evaluate the effect of feeding yeast probiotic in milk or starter on growth, fecal score, health, blood and rumen parameters, 30 female Holstein calves with average 40.4±1.8 kg birth weight in Taliseh Nemouneh dairy farm used from 14 until 65 days old. Calves randomly divided to 3 treatments including: 1) control (without probiotic) 2) yeast probiotic in starter 3) yeast probiotic in milk. Average daily gain, body weight and feed efficiency were not significantly different between treatments. Dry matter intake was significantly lower in treatment 2 than control (P<0.01). Digestibility of feed nutrients, ammonia nitrogen concentration, rumen fluid pH and blood parameters did not affected by treatments. Fecal score and health in treatment 2 and 3 were better than control. Generally, calves were fed with yeast probiotic in milk had the best fecal score and health