جستجوی مقالات مرتبط با کلیدواژه « diets » در نشریات گروه « علوم دام »

Substances of microbial origin and medicinal plants, by improving the level of health and condition of the gastrointestinal tract, provide the basis for the optimal use of nutrients in diets, and by reducing the use of nutrients, while saving production, also prevent environmental pollution. Dietary protein sources are among the most expensive nutrients, reducing their use in poultry diets not only reduces the cost of nutrition, but also prevents environmental pollution by reducing the excretion of nutrients through animal feces. The present experiment was performed to investigate the possibility of reducing the level of crude protein in broiler diets using two probiotic additives and thyme. This experiment was conducted to investigate the effects of adding probiotc and thyme medicinal plant into normal and 5% lower level crude protein on growth performance, carcass traits and blood biochemical parameters of broilers.

In this experiment 192 Ross 308 broiler chicks were used in 2×2 factorial arrangements with 4 treatments, 4 replicates and 12 chicks in each replicate in a completely randomized design in grower (11 to 24 days) and finisher (25 to 42 days) periods.

In grower period adding probiotic in contrast with thyme significantly increased the amount of daily weight gain (p<0.05). In finisher and total periods, feed additives and diets crude protein level had no effect on performance of broilers. Using probiotic in low crude protein diets redced the carcass percentage of broilers (p<0.05). The level of 5% of crude protein reducing decreased the concentration of blood triglyceride and increased the blood concentration of LDL as compared with normal level of diet crude protein (p<0.05). Thyme powder in low crude protein diets decreased the amount of blood triglyceride (p<0.05). Thyme powder with low crude protein diets increased the amount of blood LDL whereas with normal crude protein diets the level of LDL was decreaased (p<0.05).

Generaly, in broilers reducing 5% of diets crude protein had no adverse effects on their performance and also using microbial and herbal feed additives had no significant effect  on broiler performance.

The experiment was conducted to investigate the effects of cell wall carbohydrates with diet supplemented enzyme on the function and expression of glucose transporter genes (SGLT1 and GLUT2), peptide transporter (PepT1) and mucin production (MUC2) in the small intestine of broilers. In thisstudy, 1100 mixeddayold chickens (male and female), Ross 308 were used based on a completely randomized design with 11 treatments and five replications (20 birds per replication) for 42 days. Experimental diets included control diets, diets containing wheat, barley, wheat bran, rice bran, and hull less barley with and without enzymes, respectively. The results showed that the effect of diets containing wheat, barley and hull less barley withenzyme on the total live weight of broiler chickens at 42 days of age was significantly different (P <0.05).Cell wall carbohydrates of wheat, wheat bran and rice bran in diets increased pancreatic amylase activity (barley 3.02, wheat 5.99 U/mg CP of small intestinal tissue) (P < 0.05). The expression of the studied SGLT1 and MUC2 genes in the experimental diets without enzyme showed a significant increase compared to enzymessupplemented diet (P < 0.05). Also, among the groups of enzyme-supplemented diets, only wheat and rice bran groups were able to increase the expression of SGLT1, MUC2 and GLUT2 genes compared to the control group (P <0.05). In conclusion, supplementation of diets containing cell wall carbohydrates with enzyme affects the expression of glucose transport genes (SGLT1 and GLUT2), peptide transport (PepT1) and mucin production (MUC2) in the small intestine jejunum. This indicates the optimal function of the digestive system of broilers in terms of digestion and absorption of nutrients.