Shahab Sohrabi; M. Rezaee; A. Yaghobfar; A. Teymori Yansari
Abstract
Abstract:This study was conducted to evaluate the effects of dietary supplementation of guanidine acetic acid and mating management current methods on the performance of Ross 308 broiler breeders. This experiment was done in a completely randomized design and factorial methods with three levels of GAA ...
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Abstract:This study was conducted to evaluate the effects of dietary supplementation of guanidine acetic acid and mating management current methods on the performance of Ross 308 broiler breeders. This experiment was done in a completely randomized design and factorial methods with three levels of GAA (0. '0.12 and 0.16 g/kg of diet) and three mating management methods (without management, spiking and intra-spiking methods) with 6 replicates (experimental unit) and 8 hens and one rooster in each (totally 486 bird). During this period, adjectives performance (egg production percentage, egg mass weight (g/hen/d) and feed conversion ratio) were measured. Dietary inclusion of GAA at levels of 0.12 and 0.16 g/kg of diet had negative effects on the above traits (P<0.05). In addition, the use of different methods of mating management did not have a significant effect on performance traits .The interaction effects of GAA and mating management methods were not significant on egg production, egg weight, egg mass weight and feed conversion ratio. Dietary supplementation of GAA, mating management method and their interactions on fertility and hatching percentage were not significant (P>0.05). The effect of GAA level on nitric oxide concentration was significant (P<0.05). The highest concentration of nitric oxide was observed at the level of 0.12 g/kg diet, The dietary inclusion of GAA at levels of 0.12 and 0.16 g/kg of diet and the application of mating management methods could not improve production and reproduction performance of Ross 308 broilers breeders.
Mahsa Hedayati Sichani; Amir Davar Forozandeh; Pirouz Shakeri
Abstract
The objective of this study was to determine the effects of different levels of mineral biochar (MB) on performance, nutrient digestibility, and some blood parameters of Holstein calves. Twenty-seven Holstein female weaned calves (67.66 ± 9.33 kg initial BW) were randomly assigned to one of three ...
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The objective of this study was to determine the effects of different levels of mineral biochar (MB) on performance, nutrient digestibility, and some blood parameters of Holstein calves. Twenty-seven Holstein female weaned calves (67.66 ± 9.33 kg initial BW) were randomly assigned to one of three experimental diets; contained 0%, 0.35% and 0.70% of mineral biochar in concentrate respectivelyDry matter intake (DMI) and body weight gain were recorded at the end of each week. Blood samples were collected on day 48 and nutrient digestibility was measured at the end of the experimental period (days 46 to 49). Results showed that mean of total body weight gain, final body weight and daily gain were not affected by different levels of MB in diets. There was no difference in average daily dry matter intake of calves consuming different experimental diets; while, feed conversion ratio (FCR) was lower (P = 0.02) in calves fed diets containing MB compared to control group and FCR decreased linearly (P = 0.02) as the level of MB increased in the diet. Apparent total tract digestibility of OM, CP and NDF increased (P < 0.01) with diets containing MB in comparison to control group. Also, blood urea nitrogen, total protein, triglycerides and VLDL were not different across experimental diets, but, calves fed 0.35% MB had lower (p<0.05) blood cholesterol than those fed other diet. It was concluded that using of MB had favorable effects on nutrient digestibility, FCR and blood cholesterol.
Zinat Shahmari; Shahab Ghazi; Soudabeh Moradi
Abstract
The experiment was conducted to evaluate the effects of inclusion of silkworm pupae powder meal on the productive performance and egg qualitative traits of laying hens from 69 to 81 wk of age. A total of 184 Lohmann LSL laying hens was used in a completely randomized design with 5 treatments, each replicated ...
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The experiment was conducted to evaluate the effects of inclusion of silkworm pupae powder meal on the productive performance and egg qualitative traits of laying hens from 69 to 81 wk of age. A total of 184 Lohmann LSL laying hens was used in a completely randomized design with 5 treatments, each replicated 6 times. Dietary treatments were as: control diet (based on corn and soybean meal) and four diets by inclusion of 5, 7.5, 10 and 12.5% of silkworm pupae meal powder. All diets were supplied an equal amount of AME, crude protein and amino acids. For the entire experimental period, egg weight, feed conversion ratio and hen-day egg production rate were not affected by dietary treatments. However, feed intake was significantly higher for hens fed 10% of silkworm pupae powder compared to control (P≤0.05). The inclusion of silkworm pupae powder up to 7.5% significantly improved egg mass (P≤0.05) during 12 wk of the trial. None of the egg quality variables studied including albumin weight, yolk weight, abnormal and broken eggs, yolk index, egg shape index, shell weight, shell thickness, haugh unit and specific gravity was affected by dietary treatments. It is concluded that silkworm pupae powder can be used as a partial replacement for soybean meal up to 12.5% in laying-hen diets without negatively affecting bird performance and egg quality characteristics.
A. Mirhidari; N. torbatinejad; S. Hasani; Pirouz Shakeri
Abstract
Biochar is a carbonaceous material obtained when types of biomass heated in a closed container with little or no available oxygen. Biochar combines a porous structure and large surface area for microbial adhere. This study was carried out to investigate the effects of feeding pistachio by-product biochar ...
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Biochar is a carbonaceous material obtained when types of biomass heated in a closed container with little or no available oxygen. Biochar combines a porous structure and large surface area for microbial adhere. This study was carried out to investigate the effects of feeding pistachio by-product biochar (PBPB) on growth performance, microbial protein, blood metabolites and some of ruminal fermentation parameters in fattening lambs. For this purpose, 12 Kermanian male lambs (21.70 ± 1.37 kg BW) were randomly allocated to 1 of 2 experimental diets containing 0 and 1 % of PBPB (DM basis) over an 84-days period. Experimental diets were fed twice daily in two equal portions as total mixed rations. Dry matter intake (DMI) and weight gain were recorded and blood, urine and rumen fluid samples were collected at different times. Result indicated that feeding 1% PBPB had no significant effect on dry matter intake, but average daily gain, feed conversion ratio and microbial protein production were improved (p<0.05). Mean of rumen fluid pH was not affected by diets, but ruminal concentration of NH3-N was increased (p= 0.03) with substitutions of 1% PBPB. The long-term feeding of 1% PBPB had no significant effect on liver enzymes and triglycerides but, lambs fed 1% PBPB had higher blood glucose and total protein (p<0.05) than those fed other diet. It was concluded that using of PBPB up to 1% of dietary DM had favorable effects on growth performance and feed conversion ratio.
