جستجوی مقالات مرتبط با کلیدواژه « digestible amino acid » در نشریات گروه « علوم دام »

The aim of this research was to study the effect of adding enzyme preparations and ration formulation on performance, nutrient digestibility and intestinal microflora of broilers. Two hundred and fifty six day-old male and female broiler chicks of Ross 308 strain were used in a 2×2×2 factorial experiment consisting of two methods of diet formulation (total and digestible amino acid), two levels of Natuzyme Plus (0 and 0.035%) and two levels of Multi-behzyme (0 and 0.02%) as additives. The factors were arranged as a completely randomized design with eight treatments and four replications. Diet formulation based on total amino acids improved the average daily gain (ADG) and feed conversion ratio (FCR) during the grower and finisher and total periods, but decreased daily feed intake during the finisher and total periods (P ≤ 0.05). It also increased dry matter digestibility, dressing percentage and intestinal length, but it decreased fat digestibility (P ≤ 0.05). Natuzyme Plus increased dry matter, crude protein and fat digestibility and decreased the number of E .coli in the cecum. (P ≤ 0.05). Multibehzyme improved ADG during the grower period, FCR during the finisher period and total period and it increased dry matter, crude protein and crude fat digestibility (P ≤ 0.05). It was concluded that Multi- behzyme could be replaced with Natuzyme Plus, and its inclusion in the diets formulated by digestible amino acid and low protein content can improve the negative outcome of low level protein diets.

A study was conducted to determine the effects of diet formulation on Arian broiler breeder performance in their 50 to 64 wks of age. One hundred and sixty eight female and 24 male breeders were employed in 8 treatments of 3 replicates (7 females plus a male) in a completely randomized design (a factorial experience of 2 × 2 × 2). Eight experimental diets were formulated based on three factors, the first factor including, two levels of Apparent and True Metabolisable Energy corrected for nitrogen (AMEn and TMEn), the second factor being:, two levels of Total Amino Acids (TAAF) and Digestible (DAAF) of Feed, The third factor was included two levels of broiler breeder hens Requirements as based on Total Amino Acids (TAAR) and Digestible ones (DAAR). The results indicated that egg weight was significant difference on the main effects of energy and the main effects of amino acids of feed and requirements no significant (p<0.05). Treatment No. 3 (AMEn + DAAF + TAAR) was at the best level significantly in egg weight, 68.97 (g), egg production, 62.45, egg mass, 43.1 (g/hen/day) and feed conversion ratio 3.59 and treatment No. 7 (TMEn + DAAF + TAAR) was the worst level significantly in egg weight 66.51 (g), egg production, 48.21, egg mass, 31.99 (g/hen/day) and feed conversion rate 5.07. Percentage of eggs can incubate and hatchability was significant in the main effects of energy, amino acids of feed and requirements and fertility was significant in the main effects of energy and amino acids of feed, number of chicks per hen was significant in the main effect of energy and amino acid requirements (p<0.05). Percentage of eggs can incubate was in treatment No. 5 (TMEn + TAAF + TAAR), 99.48 %, fertility was in treatment No. 4 (AMEn + DAAF + DAAR), 91.87 %, hatchability was in treatment No. 2 (AMEn + TAAF + DAAR), 78.37% and the number of chickens obtained from any hens during the experimental period (50 to 64 weeks), was in treatment No. 6 (TMEn + TAAF + DAAR), 37.83 chicks, at the highest significantly level compared to Duncan multiple range test (p<0.05). This experiment showed that the type of diet formulation had significant effects on broiler breeder performance.

This study was conducted to evaluate the feed intake، body weight gain، total energy (kcal) and protein (g) intake، energy (kcal) and protein (g) intake/body weight gain، energy efficency ratio (EER) and protein efficency ratio (PER) on broiler chicks (Arian strain) fed two different energy systems (AMEn and TMEn) and two ways of expressing amino acid requirements (AMEn and TMEn) and two methods of formulation of diets AA requirements (total and digestible) on complete randomize design with four treatment and 6 replicate and 20 chickens each of replicate. the results of experiment showed that the total energy (kcal) and protein (g) intake، energy (kcal) and protein (g) intake/body weight gain، energy efficiency ratio (EER) and protein effiency ratio (PER) of broilers is significantly affected by expression energy systems and the levels of diets amino acid (total and digestible AA) (p<0/05) and formulated diet with expression energy system as TMEn and way of expressing amino acid as digestible، resulted on improved this traits، Interaction between expression energy system and levels of diets amino acid was significant for aforesaid (p<0/05).

This study was conducted to evaluate the effects of formulated diet based on nitrogen-corrected apparent and true metabolizable energy (AMEn, TMEn), total and digestible amino acid of feedstuff on broiler performance and carcass characteristics of Ross 308 broiler chickens. This experiment was carried out as 2×2 factorial arrangement with compeletely randomized desing Main factors including method of formulating diet based on total and digestible amino acid and based on apparent and true metabolizable energy of feedstuff. A total of 400 one day-old chicks were randomly assigned to 4 treatments with 5 replicates and 20 chicks per replicate. Experimental parameters for periods of 1-21, 22-42 and 1-42 days were measured. The results showed that the body weight gain and feed intake increased significantly when the chicks were fed with diet based on AMEn and digestible amino acid in whole periods of experimen (p<0.05). Feed conversion ratio significantly decreased in chicks fed with diet based on AMEn and digestible amino acid during 1-21 and 1-42 days of age. Dietary treatments had significant effect on breast and thigh yield, but had not significant effect on carcass carocteristics (p>0.05). The results obtained in the present study demonstrated that formulation of diets based on AMEn and digestible amino acid improved performance of Ross 308 broiler chicks.

An experiment was conducted to investigate the effects of different levels of rapeseed meal and diet formulation based on total and digestible amino acid (AA) using 192 day old Ross 308 male broiler chicks. Experiment was carried out using a complete block design with 4*2 factorial arrangements. The factors included different levels of rapeseed meal (0, 10, 20 and 30%) and two method of AA formulation (based on total or digestible AA requirement). Four replicates of 6 chicks were fed dietary treatments from 11 to 49 d of age during two period of grower (11-28 d of age) and finisher (28-49 d of age). Feed intake and weight gain of each experimental unit was measured at 28 and 49 d of age and then feed conversion ratio was calculated. At 28 and 49 d of age, blood sample were taken from wing vein of 2 birds per replicate and then T3 and T4 concentration of the sample were measured. Results show that different levels of rapeseed meal had no significant effect on feed intake. Diets containing 20 or 30 % rapeseed meal had highest and lowest weight gain, respectively, during the grower and finisher period. Method of formulation of AA requirements had significant effect on weight gain so that chicks fed diets formulated on the basis of digestible AA had significantly higher weight gain. Feed conversion ratios were affected by both different levels of rapeseed meal and method of diet formulation. Feed conversion ratios were increased by 30 % rapeseed meal, whereas 20% rapeseed meal significantly lowered it. Formulation of diets on the basis of digestible AA also decreased feed conversion ratios. Results obtained in our study suggest the inclusion of 20% rapeseed meal and diet formulation based on digestible AA when rapeseed meal are used in the broilers diets.