Amir Hossein Rezakhani; Younes Ali Alijoo; Kamran Rezayazdi
Volume 22, Issue 1 , March 2020, , Pages 55-65
Abstract
This study was carried out to assess the effects of two types of fatty acids-calcified salts on the performance of dairy cows in the transition period. In total, 32 multiparous Holstein cows with body weight mean of 723=39.9 kg in a 6-week time range (three weeks before until three weeks after ...
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This study was carried out to assess the effects of two types of fatty acids-calcified salts on the performance of dairy cows in the transition period. In total, 32 multiparous Holstein cows with body weight mean of 723=39.9 kg in a 6-week time range (three weeks before until three weeks after parturition) were assigned to treatments in a completely randomized design. There were four diets including control (without fat supplement), diet supplemented with unsaturated fat, diet supplemented with saturated fat and diet supplemented with both unsaturated and saturated fats. Fat supplements as calcium salts were applied at the level of 1.5% and 3% in the pre-partum and post-partum diets,respectively. Based on the results, it turned out that pre-partum DM feed intake, post-partum body weight and body condition score were not affected by the diets, whereas, post-partum DM feed intake appeared to be different (p < 0.05). In addition, the digestibility coefficient appeared to be different among pre- and post-partum trial diets (p < 0.05). However, no significant difference was observed for blood parameters as well as milk yield and its composition. In conclusion, the results revealed that fat sources as calcium salt supplements can improve the digestibility of nutrients in the digestive system, without any adverse-effects on performance in dairy cows.
Hamid Amanlou; Hadi Shafiei; Tahereh Amirabadi Farahani; Farshid Kheiri; Najme Eslamian Farsuni
Volume 18, Issue 1 , April 2016, , Pages 27-38
Abstract
In order to compare the precision of predictions of NRC (2001) and CNCPS models, 17 Holstein fresh cows were assigned in a randomized complete block design to a balanced diet with NRC (2001) and CNCPS software. The predicted DMI, energy allowable milk and protein allowable milk by both models were compared ...
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In order to compare the precision of predictions of NRC (2001) and CNCPS models, 17 Holstein fresh cows were assigned in a randomized complete block design to a balanced diet with NRC (2001) and CNCPS software. The predicted DMI, energy allowable milk and protein allowable milk by both models were compared with observed values. The precision of the predictions of models was evaluated by calculation of R2, mean bias and root mean square prediction error (RMSPE). Both models predicted DMI lower than the observed values (P<0.01). The mean bias, RMSPE and R2 were 2.22, 2.84 and 0.48 for NRC (2001) and 3.18, 3.99 and 0.52 for CNCPS, respectively and CNCPS predicted the DMI 20 percent lower than the observed value. The observed milk production was 29.78 kg/d. predicted energy allowable milk by NRC (2001) and CNCPS were 25.68 and 22.32 kg/d, respectively. Predicted protein allowable milk with NRC (2001) and CNCPS were 25.80 and 28.37 kg/d, respectively and NRC (2001) predicted the milk production 14 percent lower than observed value. Given the importance of DMI in fresh cows seems NRC (2001) has more precision compared to CNCPS for estimating nutritional requirements.
Monavareh Ghoudosi; Omid Dayani; Amin Khezri; Mohammad Mahdi Sharifi Hosseini
Volume 17, Issue 2 , October 2015, , Pages 359-370
Abstract
The effect of feeding silage of leaf and stem of banana tree with waste date palm on feed intake, microbial protein synthesis and blood parameters using four adult rams in a change- over design with four 21-days period were examined. Eighty five kg leaf and stem of banana tree with 15 kg of waste date ...
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The effect of feeding silage of leaf and stem of banana tree with waste date palm on feed intake, microbial protein synthesis and blood parameters using four adult rams in a change- over design with four 21-days period were examined. Eighty five kg leaf and stem of banana tree with 15 kg of waste date palm were mixed together and ensiled for 45 days. Chemical composition and sensory evaluation of silage of leaf and stem of banana tree with waste date palm was evaluated and used in experimental diets as zero, seven, 14 and 21 percent of DM. According to sensory evaluations, silage with a score of 20 had a very good rating. Nitrogen retention in sheep fed 21 percent silage was lower than the control group (P<0.05). Dry matter digestibility of experimental diets containing 14 and 21 percent silage was lower than diets containing zero and seven percent silage (P<0.05). The mean excretion of allantoin, uric acid and total purine derivatives in the urine of sheep were increased linearly (P<0.05) with increasing the silage in the experimental diets. Increasing of nitrogen and microbial protein synthesis in sheep fed diet containing 21 percent silage was more than sheep fed diet without silage (P<0.05). Increasing of the silage level in diet, was increased triglyceride concentration by linearly (P<0.05). According to the results, using of 21 percent silage of leaf and stem of banana tree with waste date palm in sheep diet without change in dry matter intake, increase microbial protein synthesis.