Hassan Lakzaie; Farzad Ghanbari; Javad Bayat Kouhsar; Ashoor Mohammad Gharehbash
Volume 22, Issue 1 , March 2020, , Pages 173-185
Abstract
This research was conducted in order to compare the blood parameters and fattening performance of Zel and Dalagh breeds male lambs (three to four months old), and their crossbred with Romanov in different thermal-humidity conditions. Fattening trial was conducted in Gonbad kavous with four ...
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This research was conducted in order to compare the blood parameters and fattening performance of Zel and Dalagh breeds male lambs (three to four months old), and their crossbred with Romanov in different thermal-humidity conditions. Fattening trial was conducted in Gonbad kavous with four treatments and six replicates for 84 days from mid-August to early November. Based on the temperature-humiity index (THI), the lambs were under very severe and severe of heat stress up to 8th weeks of trial, followed by non-stress conditions (THI index of 25.6 and above that, 23.3 up to less than 25.6 and less than 22.2 respectively). In the very severe heat stress condition, the performance of treatments was the same. In the severe heat stress, the performance of Dallagh lambs and their crossbred with Romanov was better than Zel and Zel-Romanov crossbred (P<0.05). In un-stress conditions, performance traits in Zel Romanov crossbred was lower than other treatments (P<0.05). Glucose and cholesterol concentration were lower when the lambs were in heat stress condition than normal time (P<0.05). Unlike, blood urea concentration in heat stress condition was higher than lack of stress time (P<0.05). Concentrations of nonstratified fatty acids (NEFA) in the middle period of experiment, during severe heat stress, were higher than those of very severe and nonstress periods. In whole of fattening trial period, all of the breeds had lower performance than expected, indicating the effects of heat stress on them. Totally, Dalagh breed lams had better fattening performance than Zel and their crossbred with Romanov, especially under very severe heat stress condition.
Naser Mahmoudnia; Behrouz Dastar; Omid Ashayerizadeh; Javad Bayat
Volume 21, Issue 2 , July 2019, , Pages 261-271
Abstract
Two experiments were conducted to determine the nutrient ileal digestibility of raw date pit (RDP) and fermented date pit (FDP) as well as their effects on performance and some bloody traits in broiler chickens,. The first experiment was conducted in a completely randomized design with 72 male broiler ...
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Two experiments were conducted to determine the nutrient ileal digestibility of raw date pit (RDP) and fermented date pit (FDP) as well as their effects on performance and some bloody traits in broiler chickens,. The first experiment was conducted in a completely randomized design with 72 male broiler chicks, three treatments and six replicates (four chicks each) . The treatments consisted of a corn – soybean diet and two experimental diets which prepared by replacing RDP and FDP to basal diet at 25 %. The second experiment was performed in a 2× 4 factorial arrangement along with a control treatment in completely randomized design in a population of 540 day old broiler chickens in nine treatments with five replicates (12 chicks each). Dietary treatments included a diet without date pit (control), and diets containing two, four, six and eight percent of RDP or FDP. The digestibility of crude protein, fiber and ash in the FDP were higher than RDP (p<0.05). Feeding broiler chickens with FDP compared to RDP, improved weight gain (2110.5 g vs 1991.3 g ) and increased feed intake (p<0.05). The blood cholesterol and LDL-c decreased in chickens fed by FDP compared to RDP (p<0.05). According to the results of this experiment fermentation of date pit increases digestibility of its nutrients and improves weight gain of broiler chickens.
Mohammad Heidarian; JAvad Bayad Koohsar; Youssef Moostafloo; Balal Sadeghi; Farid Moslemipoor
Volume 18, Issue 3 , October 2016, , Pages 461-475
Abstract
In order to compare the effects of different weaning strategies on feed intake, structural growth measurement and health, blood metabolites and economic efficiency of young dairy calves, twenty four female Holstein calves were used. Calves after birth were randomly assigned into one of three weaning ...
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In order to compare the effects of different weaning strategies on feed intake, structural growth measurement and health, blood metabolites and economic efficiency of young dairy calves, twenty four female Holstein calves were used. Calves after birth were randomly assigned into one of three weaning strategy as follow: 1) weaning based on feed intake, 2) weaning based on weight gain (30 kg weight gain compared to the birth weight), and 3) weaning based on age (at 90 days of age). Starter intake measurement and fecal scoring conducted daily. Calves were weighed weekly and blood samples were obtained on days 21, 42, 60 and 90 after birth. Results showed that there were significant differences among different weaning strategies on average weaning age and milk consumption (p<0.05). All treatments had similar average daily weight gain, average daily feed intake, final weight and structural growth measurements. Calves weaned based on feed intake had lowest ruminal pH and N-NH3 concentration and blood urea nitrogen on day 90 (p<0.05). There were differences between groups on milk cost and total cost (milk + feed) and feed cost per kg of BW gain, so that Weaning based of feed intake compared to weaning based on weight and age saved up to 6000 and 3000 Rials per kg of body weight, respectively. Generally, similar growth and performance among different weaning strategies as well as reduction the cost of raising of calves indicated that calves weaning based on feed intake can be profitable approach.
Aynaz Aslaniyan; Farzad Ghanbari2; Javad Bayat Kouhsar; Behrouz Karimi Shahraki
Volume 18, Issue 2 , June 2016, , Pages 235-248
Abstract
This research was conducted to determine the effect of gamma ray (GR) (100 and 150 kGy), sodium hydroxide (50 g/kg DM) and calcium oxide (160 g/kg DM) on gas production parameters and in vitro digestibility of soybean straw. All treatments, except for the gamma ray (100 and 150 kGy) did not have gas ...
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This research was conducted to determine the effect of gamma ray (GR) (100 and 150 kGy), sodium hydroxide (50 g/kg DM) and calcium oxide (160 g/kg DM) on gas production parameters and in vitro digestibility of soybean straw. All treatments, except for the gamma ray (100 and 150 kGy) did not have gas production up to 4 hours after incubation and there was a lag time. From 8 to 96 hours of incubation, the highest gas production was observed in sodium hydroxide + gamma ray (100 and 150 kGy) treatments (P< 0.05). Processing had no effect on gas production rate (P>0.05), but increased gas production potential (b) (P<0.05). The highest amount for b fraction was observed in sodium hydroxide + GR (100 and 150 kGy) treatment. Organic matter digestibility (OMD), metabolizable energy (ME), net energy (NE) and short chain fatty acids (SCFA) increased by processing (P<0.05). The highest increase was observed for sodium hydroxide (100 and 150 kGy). In vitro digestibility of the dry matter (DM) and organic matter (OM) was increased by GR, sodium hydroxide, and their combination (P<0.05). However, treatments with calcium oxide did not affect these traits. Except for GR at doses of 100 and 150 kGy, the other treatments reduced ammoniacal nitrogen (NH3-N) (P<0.05). Microbial mass production after 24 hours incubation showed decrease in calcium oxide and calcium oxide + GR treatments (P<0.05). Based on the results of this research, nutritional value of soybean straw improves with GR and sodium hydroxide treatments.