Reza Karimi; Armin Towhidi; Mahdi ganjkhanlou; Sepideh Khoee; Hamid Ghasemzadeh-Nava; Amir Alijani; Mohamadjavad Mozafari
Volume 24, Issue 3 , October 2022, , Pages 365-372
Abstract
The aim of the present experiment was to evaluate the effect of feeding a glucogenic diet on the somatotropic axis of early lactation Holstein dairy cows. Sixteen fresh cows were used in a completely randomized design with two treatments and eight replicates in each treat. In the treatment of glucogenic ...
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The aim of the present experiment was to evaluate the effect of feeding a glucogenic diet on the somatotropic axis of early lactation Holstein dairy cows. Sixteen fresh cows were used in a completely randomized design with two treatments and eight replicates in each treat. In the treatment of glucogenic diet, cows received 600 g of encasulated glucose daily as top dressed. In the control treatment, the cows received daily the same amount of glucose and coating material (mainly fat). Experimental diets were fed from day 4 to 30 after calving. Milk production and dry matter intake were recorded daily. Blood samples collected on days 4, 15 and 29 after parturition from coccygeal vein. The results show that there is no significant difference between treatments in terms of milk yield, energy corrected milk yield, 3.5% fat corrected milk yield, dry matter intake and blood glucose concentration. The glucogenic diet caused a significant increase in blood insulin (P<0.05) and a numerical increase in blood IGF-1 (P<0.15). Cows that received control diet showed a significant decrease in IGF-1 concentration (P<0.05) but no significant decrease was observed for cows received diet containing glucogenic supplement. The results of this study showed that feeding a glucogenic supplements can affect the somatotropic axis of early cows and cause an increase glucose turnover and blood insulin and relative improvement of blood IGF-1 levels.
Ayub Mohammadi; Farhang Fatehi; Abolfazl Zali; Mehdi ganjkhanlou; Amirhossein Sarzaem
Volume 22, Issue 2 , June 2020, , Pages 259-269
Abstract
The objective of this study was to evaluate the effects of feed bunk space and forage particle size on feed intake and nutrient digestibility in growing Holstein female calves. Fourty Holstein female calves with an average age of 8-12 months (295.6 ± 32.8 kg) were used in a 2×2 factorial ...
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The objective of this study was to evaluate the effects of feed bunk space and forage particle size on feed intake and nutrient digestibility in growing Holstein female calves. Fourty Holstein female calves with an average age of 8-12 months (295.6 ± 32.8 kg) were used in a 2×2 factorial change-over design (with four treatments, four periods and four stalls), in which 10 calves were allocated to each stall. The current experiment lasted 4 months as one month allocated to each period. The experimental treatments were included: 1) 24 cm of feed bunk space and average forage particle size of 4.6 mm (24/fine); 2) 24 cm of feed bunk space and average forage particle size of 7.1 mm (24/coarse); 3) 48 cm of feed bunk space and average forage particle size of 4.6 mm (48/fine); 4) 48 cm of feed bunk space and average forage particle size of 7.1 mm (48/coarse). The results of this study showed that the apparent digestibilities of DM, CP and NDF for the 48/Coarse treatment was the highest, the treatment of 24/Coarse had an intermediate state, and for the treatment of 48/fine and 24/fine were the lowest. Also, apparent digestibilities of DM, CP and NDF were higher for treatments including coarse forage particles than treatments with fine forage particle size. Finally, it seems that feeding growing Holstein heifers with diets containing coarse forage particle size could result in better nutrient digestibility.
hamid amanlou; abolfazl zali
Volume 19, Issue 2 , August 2017, , Pages 337-348
Abstract
The aim of this study was to evaluate the effects of Pomegranate seed pulp (PSP) containing long-chain fatty acids with L-carnitine (LC) on performance and carcass traits of thirty two Mahabadi male kids. Experimental diets were 1) diet without PSP and LC 2) diet with 10% PSP Kg/DMI and without ...
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The aim of this study was to evaluate the effects of Pomegranate seed pulp (PSP) containing long-chain fatty acids with L-carnitine (LC) on performance and carcass traits of thirty two Mahabadi male kids. Experimental diets were 1) diet without PSP and LC 2) diet with 10% PSP Kg/DMI and without LC 3) diet without PSP and with 300ppm LC Kg/DMI and 4) diet with 10% PSP and 300ppm LC Kg/DMI. Kids were slaughtered at the end of study and carcass characteristics were measured. Addition of PSP and LC in diet decreased kidney fat (P<0.05). The kids fed with PSP and LC supplement had higher fat digestibility than other treatments (P<0.05). Furthermore, the use of PSP in the diet decreased the feed cost per Kg of hot carcass (P=0.05). The results of this study indicated that replacing a part of dietary cereal grains with PSP and LC supplement decreased kidney fat. Also, the simultaneous use of LC and PSP increased apparent digestibility of fat, and showed numerically higher performance. According to the results of this study, the PSP can be used as an economical byproduct without negative effects on performance, and along with LC in the diet of kids it will reduce kidney fat as well.
Moustafa Hajilou; Hamid Reza Mirzaei Alamouti; Mehdi Ganjkhanlou; Hamid Amanlou
Volume 17, Issue 2 , October 2015, , Pages 347-358
Abstract
Four ruminally-cannulated Holstein cows were used in a 4 × 4 Latin square changeover design within periods of 21 days to evaluate effects of feeding frequency of different sources of rumen degradable nitrogen on total tract digestibility of nutrients, feeding behaviors, rumen and blood metabolites ...
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Four ruminally-cannulated Holstein cows were used in a 4 × 4 Latin square changeover design within periods of 21 days to evaluate effects of feeding frequency of different sources of rumen degradable nitrogen on total tract digestibility of nutrients, feeding behaviors, rumen and blood metabolites of Holstein cows. Treatments were: 1) control diet which was as total mixed ration (TMR) offered once daily in the morning (08:00), 2) control diet in which a part of its soybean was offered at 19:00, 3) control diet in which a part of its urea was offered at 19:00 and 4) control diet in which a part of its fish meal was offered at 19:00. Rumination time increased in cows fed twice daily with protein sources (P<0.05). Total tract digestibility of dry matter and organic matter were higher in cows received urea at the evening time. Total tract digestibility of neutral detergent fiber increased with feeding all sources of protein at the evening time (P<0.05). Molar proportion of volatile fatty acids, rumen pH and rumen ammonia concentration were not affected by feeding time of protein sources. The results indicated that increasing delivery of rumen degradable nitrogen sources improved dry matter and fiber digestibility and chewing activity of non-lactating Holstein dairy cows.