Masomeh Nasiroleslami; Mehran Torki; Alireza Abdolmohammadi
Volume 20, Issue 1 , May 2018, , Pages 95-108
Abstract
This study was conducted to determine the effects of dietary supplemental guanidinoacetic acid and betaine on performance, carcass characteristics, meat quality and thyroid hormones of broilers subjected to cold stress. Based on a 2×2 factorial arrangement, 384 day-old male broiler chicks (Cobb) ...
Read More
This study was conducted to determine the effects of dietary supplemental guanidinoacetic acid and betaine on performance, carcass characteristics, meat quality and thyroid hormones of broilers subjected to cold stress. Based on a 2×2 factorial arrangement, 384 day-old male broiler chicks (Cobb) were randomly distributed between four experimental diets (with eight replicates) included basal diet (as control) and the basal diet supplemented with 1200 mg/kg guanidinoacetic acid; 600 mg/kg betaine and 1200 mg/kg guanidinoacetic acid + 600 mg/kg betaine. This trial was performed at the Animal Farm of Razi University (March 2015). In order to create cold stress, on 21th day all birds were subjected to a low temperature (12-15°C), which was remained constant until the end of the experiment. There was no significant effect of experimental diets on the chick’s performance, carcass characteristics, thyroid hormones and liver glycogen levels. Increased breast meat was observed in birds fed the guanidinoacetic acid-included diet. Significant increased L* and a* of meat color were detected in birds fed diets supplemented with guanidinoacetic acid and betaine. Decreased crud fat percentage of breast meat was detected in birds fed the betaine-included diet. The meat pH decreased by time. Increased meat pH was observed in birds fed the betaine-included diet. In conclusion, improved yield and decreased crud fat percentage of breast meat were observed in birds fed the guanidinoacetic acid- and betaine-included diets, respectively. Color indices of broiler breast meat was improved by diet supplementation with guanidinoacetic acid and betaine.
Zahra Ranjbar; Mehran Torki; Mohammad Amir Karimi Torshizi
Volume 19, Issue 4 , March 2018, , Pages 847-861
Abstract
The experiment was conducted to investigate the effect of in ovo injection and dietary feeding of flavonoid (Naringin & Hesperidin) on performance, carcass quality, meat antioxidant stability and hindgut microflora by total 600 fertile eggs were used for amnion injection (17.5th day of embryonic) ...
Read More
The experiment was conducted to investigate the effect of in ovo injection and dietary feeding of flavonoid (Naringin & Hesperidin) on performance, carcass quality, meat antioxidant stability and hindgut microflora by total 600 fertile eggs were used for amnion injection (17.5th day of embryonic) and hatched chicked divided randomly in four replications with 10 birds for growing period until 42d. Treatments by completely randomize design were 1, 2 and 3) 50, 100, 175 mg/kg flavonoids in diet, respectively, 4 and 5) 15, 30 mg/egg injection of flavonoid respectively and 6) injection of 15 mg/ egg and feeding 50 mg/kg flavonoid and 7) injection of 30 mg/ egg and feeding175 mg/kg and 8) control group. Treatments did not have a significant effect on performance traits compare to control group. Reduction of Malondialdehyde substances in tight and breast meat were observed in treatments (except 4) at 28 and 42 days than in the control group significantly (P<0.05). The results showed an increase in population of aerobic and Lactobacillus and reduction in Coliforms of treatments than the control (P<0.05) group. Therefore, adding 175 mg with or without 30 mg injection (high levels) of flavonoid to diet improved meat quality and dietary with 50 mg with or without 15 mg of flavanoid injection caused improvement in microbial population in hindgut. In overall dietary with or without injection of flavanones have positive effects on health and meat quality of broilers.
Mohammad Zarei; Mohammad Ehsani; Mehran Torki
Volume 13, Issue 2 , March 2012, , Pages 61-71
Abstract
To evaluate effects of adding two probiotics (Thepax and Yeasturer) and two prebiotics (Fermacto and A-Max), and one synbiotic (Biomin) to iso-caloric and iso-nitrogenous diet (ME = 2720 kcal/kg and CP =145 g/kg) on performance of laying hens and egg quality traits, 216 Lohmann LSL-Lite 76-wk old laying ...
Read More
To evaluate effects of adding two probiotics (Thepax and Yeasturer) and two prebiotics (Fermacto and A-Max), and one synbiotic (Biomin) to iso-caloric and iso-nitrogenous diet (ME = 2720 kcal/kg and CP =145 g/kg) on performance of laying hens and egg quality traits, 216 Lohmann LSL-Lite 76-wk old laying hens were divided in 36 cages (n = 6). Productive performance of hens was recorded for six weeks and egg quality characteristics were measured on the last week of trial. Feed additives did not have significant effect on EP, FCR, FI and EM in the present study. Including diets with feed additives in the present experiment significantly increased EW. Egg shell weight and shell thickness were increased in the hens fed additive-included diets compared to hens fed the control diet. In conclusion, feed additives used in this investigation did have beneficial effects on egg quality characteristics in terms of egg shell weight and shell thickness, with no beneficial effects on hens' productive performance.