Abbas Rajaeerad; Gholam Reza Ghorbani; Mohammad Khorvash; Ali Sadeghi-Sefidmazgi; Amir Hossein Mahdavi; Masoud Boroumand Jazi; Mirja Rosmarie Wilkens
Volume 23, Issue 1 , March 2021, , Pages 21-33
Abstract
The effects of different levels of mild metabolic acidosis by anionic diet on the performance of transition dairy cows were investegieted in 12 cows from 3 weeks (wk) before calving. One wk before calving, cows assigned to two groups according to urine pH (UpH) to recommended level (R UpH=6.2 ...
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The effects of different levels of mild metabolic acidosis by anionic diet on the performance of transition dairy cows were investegieted in 12 cows from 3 weeks (wk) before calving. One wk before calving, cows assigned to two groups according to urine pH (UpH) to recommended level (R UpH=6.2 to 7) and less than 6.3 (low UpH). The average prepartum urine pH was 6.7 and 5.8 for R UpH and low UpH groups, respectively (P<0.01). The prepartum serum concentration of Ca was not affected by the experimental groups, but significantly increased in the low UpH group within 2 h after calving. A trend was observed for higher serum concentration of phosphorus in the low UpH cows before calving. Although no significant difference was observed in prepartum DMI, but postpartum DMI and milk production were higher during wk 1 after calving in low UpH group (P<0.05). Total concentrations of protein and globulin were decreased on the day before calving in low UpH group. Also, after calving the concentrations of BUN, total protein, globulin, and milk protein were lower in this group of cows (P<0.05). Therefore, the induction of higher levels of metabolic acidosis in comparison to the recommended level before calving, can improve serum concentration of Ca and performance of transition cows.
Ali Kahyani; G. R. Ghorbani; M. Alikhani; E. Ghasemi; A. Sadeghi-Sefidmazgi; Sayyed Mahmoud Nasrollahi
Volume 20, Issue 3 , November 2018, , Pages 425-435
Abstract
The study was conducted to evaluate indigestible neutral detergent fiber (iNDF) and other related parameters of fiber digestibility of alfalfa hay, corn silage, wheat straw, beet pulp, and wheat bran of a dairy farm. Using two cannulated non-lactating Holstein cows and in situ method, undigested neutral ...
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The study was conducted to evaluate indigestible neutral detergent fiber (iNDF) and other related parameters of fiber digestibility of alfalfa hay, corn silage, wheat straw, beet pulp, and wheat bran of a dairy farm. Using two cannulated non-lactating Holstein cows and in situ method, undigested neutral detergent fiber (uNDF) after 288 h was measured as indicator of iNDF. Then with evaluating the kinetic of fiber digestibility in several time points, the rate and extent of NDF digestibility (NDFD) were measured according to newly-developed equations. The measured NDFD was used for estimation of total tract NDF digestibility (TTNDFD). Alfalfa hay had a greater amount of lignin as well as greater rate of NDF digestion than corn silage and wheat straw. Alfalfa hay and wheat straw, compared with corn silage, had a greater amount of uNDF and lower NDFD and TTNDFD. In spite of having relatively similar amount of NDF, the beet pulp and wheat bran had lower amounts of lignin and uNDF, while greater rate and extent of NDF digestibility as well as TTNDFD than forages. Overall, the considered fibrous feedstuffs showed a considerable variation in uNDF, NDFD, and TTNDFD that must be considered at the time of use.
Seyede Asma Mousavi; Seyed Amir Hossein Mahdavi; Ahmad Riasi; Ali Sadeghi-Sefidmazgi
Volume 17, Issue 2 , October 2015, , Pages 321-333
Abstract
The effects of dietary inclusion of medicinal plants’ by-product mixture on performance, the relative internal organ weight, ileal microbial counts, and small intestinal and liver morphologic alterations in laying hens receiving different omega-6 to omega-3 ratios as a 2×3 factorial arrangements ...
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The effects of dietary inclusion of medicinal plants’ by-product mixture on performance, the relative internal organ weight, ileal microbial counts, and small intestinal and liver morphologic alterations in laying hens receiving different omega-6 to omega-3 ratios as a 2×3 factorial arrangements with three levels of plants’ by-product (zero, 2.5 and five percent) and two omega-6 to omega-3 ratios based on completely randomized design containing six treatments with four replicates of five birds each. Feeding low dietary omega-6 to omega-3 ratio to hens led to a significant increase in the relative spleen weight, the number and diameter of lamina propria lymphoid follicles and middle egg production percentage (P=0.05), and a reduction in the relative liver weight and hepatic fat percentage (P<0.05). Furthermore, dietary inclusion of plants’ by-product mixture improved villi height, the numbers and diameter of lamina propria lymphoid follicles, the number of goblet cells (P<0.05) as well as feed conversion ratio (P=0.08). Hepatic malondialdehyde concentration and ileal Escherichia coli population was decreased (P<0.01) in hens given plants’ by-product mixture. Therefore, our findings indicated that low dietary omega-6 to omega-3 ratio could improve egg production slightly, and administration of five percent of medicinal plants’ by-product mixture as a result of synergistic effect expressions could improve intestinal and hepatic health indices as well as feed conversion ratio in laying hens.