Milk fatty acids profiles and milk production from dairy cows fed different forage quality diets
Thirty lactating Holstein cows were used to investigate the effects of different forages quality on milk fatty acids (FA) profiles and production. The cows were assigned to 3 dietary treatments (n = 10 per treatment) in a randomized block design with 3 repeated measures. They were fed the experiment...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2016-12-01
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| Series: | Animal Nutrition |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S240565451630083X |
| _version_ | 1829483244796510208 |
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| author | Shuaiwang Liu Runhou Zhang Rong Kang Jinzhu Meng Changjin Ao |
| author_facet | Shuaiwang Liu Runhou Zhang Rong Kang Jinzhu Meng Changjin Ao |
| author_sort | Shuaiwang Liu |
| collection | DOAJ |
| description | Thirty lactating Holstein cows were used to investigate the effects of different forages quality on milk fatty acids (FA) profiles and production. The cows were assigned to 3 dietary treatments (n = 10 per treatment) in a randomized block design with 3 repeated measures. They were fed the experimental diets for 90 d with 3 days of collection of samples for analysis at about 27 d intervals (samples were collected on days 28, 29, 30, 58, 59, 60, 88, 89 and 90). The treatments were (DM basis): 1) mixed forages diet (MF) consisting of 3.7% Chinese wild rye, 26.7% corn silage and 23.4% alfalfa hay; 2) corn stalk diet 1 (CS1) where corn stalk was used to formulate a similar chemical nutrient level to MF; 3) corn stalk diet 2 (CS2) which used corn stalk to formulate a similar forage level to MF for the diet. Dry matter intake and BW were similar between treatments, but daily milk yield, milk fat and protein yield decreased (P < 0.05) in CS1 and CS2 compared with MF, with CS2 being the lowest (P < 0.05). In total FA of milk, the compositions of C18:1c9, C18:3 and unsaturated FA increased (P < 0.05) in CS1 and CS2 compared with MF, and C18:0 and trans-C18:1 were trended to increase (P < 0.10), but C4:0-C16:0 were decreased (P < 0.05). Compared with cows fed CS2, cows receiving CS1 increased the compositions of C4:0 to C12:0 and C18:2 (P < 0.05). The results suggests feeding corn stalk could produce a greater proportion of unsaturated fatty acid (UFA) in milk fat without resulting in milk fat depression (MFD) in mid lactation cows, but simply increasing the ratio of concentrate in low forages diets is not an effective way to increase milk fat synthesis and milk production. |
| first_indexed | 2024-12-14T22:03:25Z |
| format | Article |
| id | doaj.art-94971995d68843488d9c0614d857ff12 |
| institution | Directory Open Access Journal |
| issn | 2405-6545 |
| language | English |
| last_indexed | 2024-12-14T22:03:25Z |
| publishDate | 2016-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Animal Nutrition |
| spelling | doaj.art-94971995d68843488d9c0614d857ff122022-12-21T22:45:55ZengKeAi Communications Co., Ltd.Animal Nutrition2405-65452016-12-012432933310.1016/j.aninu.2016.08.008Milk fatty acids profiles and milk production from dairy cows fed different forage quality dietsShuaiwang Liu0Runhou Zhang1Rong Kang2Jinzhu Meng3Changjin Ao4College of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, ChinaCollege of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, ChinaCollege of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, ChinaWujiang River Institute of Agriculture & Forestry Economics, Tongren University, Tongren 554300, ChinaCollege of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, ChinaThirty lactating Holstein cows were used to investigate the effects of different forages quality on milk fatty acids (FA) profiles and production. The cows were assigned to 3 dietary treatments (n = 10 per treatment) in a randomized block design with 3 repeated measures. They were fed the experimental diets for 90 d with 3 days of collection of samples for analysis at about 27 d intervals (samples were collected on days 28, 29, 30, 58, 59, 60, 88, 89 and 90). The treatments were (DM basis): 1) mixed forages diet (MF) consisting of 3.7% Chinese wild rye, 26.7% corn silage and 23.4% alfalfa hay; 2) corn stalk diet 1 (CS1) where corn stalk was used to formulate a similar chemical nutrient level to MF; 3) corn stalk diet 2 (CS2) which used corn stalk to formulate a similar forage level to MF for the diet. Dry matter intake and BW were similar between treatments, but daily milk yield, milk fat and protein yield decreased (P < 0.05) in CS1 and CS2 compared with MF, with CS2 being the lowest (P < 0.05). In total FA of milk, the compositions of C18:1c9, C18:3 and unsaturated FA increased (P < 0.05) in CS1 and CS2 compared with MF, and C18:0 and trans-C18:1 were trended to increase (P < 0.10), but C4:0-C16:0 were decreased (P < 0.05). Compared with cows fed CS2, cows receiving CS1 increased the compositions of C4:0 to C12:0 and C18:2 (P < 0.05). The results suggests feeding corn stalk could produce a greater proportion of unsaturated fatty acid (UFA) in milk fat without resulting in milk fat depression (MFD) in mid lactation cows, but simply increasing the ratio of concentrate in low forages diets is not an effective way to increase milk fat synthesis and milk production.http://www.sciencedirect.com/science/article/pii/S240565451630083XDairy cowForage qualityMilk fatty acids profilesMilk production |
| spellingShingle | Shuaiwang Liu Runhou Zhang Rong Kang Jinzhu Meng Changjin Ao Milk fatty acids profiles and milk production from dairy cows fed different forage quality diets Animal Nutrition Dairy cow Forage quality Milk fatty acids profiles Milk production |
| title | Milk fatty acids profiles and milk production from dairy cows fed different forage quality diets |
| title_full | Milk fatty acids profiles and milk production from dairy cows fed different forage quality diets |
| title_fullStr | Milk fatty acids profiles and milk production from dairy cows fed different forage quality diets |
| title_full_unstemmed | Milk fatty acids profiles and milk production from dairy cows fed different forage quality diets |
| title_short | Milk fatty acids profiles and milk production from dairy cows fed different forage quality diets |
| title_sort | milk fatty acids profiles and milk production from dairy cows fed different forage quality diets |
| topic | Dairy cow Forage quality Milk fatty acids profiles Milk production |
| url | http://www.sciencedirect.com/science/article/pii/S240565451630083X |
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