Daytime Grazing in Mountainous Areas Increases Unsaturated Fatty Acids and Decreases Cortisol in the Milk of Holstein Dairy Cows
The effects of grazing lactating cows in mountainous areas for 12 and 24 h compared with the confined indoor system were evaluated by examining the overall milk fatty acid and cortisol. Twenty-one dairy cows were allocated to three treatment groups: (1) control (confined management system in a free-...
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MDPI AG
2021-10-01
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| Series: | Animals |
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| Online Access: | https://www.mdpi.com/2076-2615/11/11/3122 |
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| author | Jalil Ghassemi Nejad Bae-Hun Lee Ji-Yung Kim Kyung-Il Sung Hong-Gu Lee |
| author_facet | Jalil Ghassemi Nejad Bae-Hun Lee Ji-Yung Kim Kyung-Il Sung Hong-Gu Lee |
| author_sort | Jalil Ghassemi Nejad |
| collection | DOAJ |
| description | The effects of grazing lactating cows in mountainous areas for 12 and 24 h compared with the confined indoor system were evaluated by examining the overall milk fatty acid and cortisol. Twenty-one dairy cows were allocated to three treatment groups: (1) control (confined management system in a free-stall barn; TMR based), (2) grazing for 12 h (12 hG; TMR plus grazing pasture), and (3) grazing for 24 h (24 hG; pasture-based feeding system). Dry matter intake was higher in the control and 12 hG groups than in the 24 hG group. The yields of total milk and the 3.5% fat-corrected milk were the lowest in the 24 hG group. Milk fat was the highest in the 24 hG group and higher in 12 hG compared with the control group. Milk protein and lactose levels were the highest in the 12 hG group. The highest somatic cell count was observed in the 24 hG group. The saturated fatty acid levels were higher in the control group compared with the 12 hG and 24 hG groups. There was no difference in overall mono-unsaturated fatty acids between 12 hG and 24 hG groups. Poly-unsaturated fatty acids were higher in the 12 hG group compared with the control and 24 hG groups. There was no difference in omega-6 (ω-6) fatty acids among the groups, and omega-3 fatty acids were higher in the 12 hG group than in the control group. Milk cortisol was the highest in the 24 hG group and higher in the control group compared with the 12 hG group. Taken together, grazing for 12 h is advisable for farms that have access to mountainous areas to improve the milk fatty acid profile and decrease the stress levels in high-yielding Holstein lactating cows. |
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| last_indexed | 2024-03-09T04:35:34Z |
| publishDate | 2021-10-01 |
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| series | Animals |
| spelling | doaj.art-1dd2c6ff58b8489c87ebdd7522ecfd062023-12-03T13:27:51ZengMDPI AGAnimals2076-26152021-10-011111312210.3390/ani11113122Daytime Grazing in Mountainous Areas Increases Unsaturated Fatty Acids and Decreases Cortisol in the Milk of Holstein Dairy CowsJalil Ghassemi Nejad0Bae-Hun Lee1Ji-Yung Kim2Kyung-Il Sung3Hong-Gu Lee4Department of Animal Science and Technology, Konkuk University, Seoul 05029, KoreaNational Institute of Animal Science, RDA, Cheonan 31000, KoreaCollege of Animal Life Sciences, Kangwon National University, Chucnheon 24341, KoreaCollege of Animal Life Sciences, Kangwon National University, Chucnheon 24341, KoreaDepartment of Animal Science and Technology, Konkuk University, Seoul 05029, KoreaThe effects of grazing lactating cows in mountainous areas for 12 and 24 h compared with the confined indoor system were evaluated by examining the overall milk fatty acid and cortisol. Twenty-one dairy cows were allocated to three treatment groups: (1) control (confined management system in a free-stall barn; TMR based), (2) grazing for 12 h (12 hG; TMR plus grazing pasture), and (3) grazing for 24 h (24 hG; pasture-based feeding system). Dry matter intake was higher in the control and 12 hG groups than in the 24 hG group. The yields of total milk and the 3.5% fat-corrected milk were the lowest in the 24 hG group. Milk fat was the highest in the 24 hG group and higher in 12 hG compared with the control group. Milk protein and lactose levels were the highest in the 12 hG group. The highest somatic cell count was observed in the 24 hG group. The saturated fatty acid levels were higher in the control group compared with the 12 hG and 24 hG groups. There was no difference in overall mono-unsaturated fatty acids between 12 hG and 24 hG groups. Poly-unsaturated fatty acids were higher in the 12 hG group compared with the control and 24 hG groups. There was no difference in omega-6 (ω-6) fatty acids among the groups, and omega-3 fatty acids were higher in the 12 hG group than in the control group. Milk cortisol was the highest in the 24 hG group and higher in the control group compared with the 12 hG group. Taken together, grazing for 12 h is advisable for farms that have access to mountainous areas to improve the milk fatty acid profile and decrease the stress levels in high-yielding Holstein lactating cows.https://www.mdpi.com/2076-2615/11/11/3122milk cortisolmilk fatty acidsgrazing animalsHolstein dairy cowsomega-3 fatty acids |
| spellingShingle | Jalil Ghassemi Nejad Bae-Hun Lee Ji-Yung Kim Kyung-Il Sung Hong-Gu Lee Daytime Grazing in Mountainous Areas Increases Unsaturated Fatty Acids and Decreases Cortisol in the Milk of Holstein Dairy Cows Animals milk cortisol milk fatty acids grazing animals Holstein dairy cows omega-3 fatty acids |
| title | Daytime Grazing in Mountainous Areas Increases Unsaturated Fatty Acids and Decreases Cortisol in the Milk of Holstein Dairy Cows |
| title_full | Daytime Grazing in Mountainous Areas Increases Unsaturated Fatty Acids and Decreases Cortisol in the Milk of Holstein Dairy Cows |
| title_fullStr | Daytime Grazing in Mountainous Areas Increases Unsaturated Fatty Acids and Decreases Cortisol in the Milk of Holstein Dairy Cows |
| title_full_unstemmed | Daytime Grazing in Mountainous Areas Increases Unsaturated Fatty Acids and Decreases Cortisol in the Milk of Holstein Dairy Cows |
| title_short | Daytime Grazing in Mountainous Areas Increases Unsaturated Fatty Acids and Decreases Cortisol in the Milk of Holstein Dairy Cows |
| title_sort | daytime grazing in mountainous areas increases unsaturated fatty acids and decreases cortisol in the milk of holstein dairy cows |
| topic | milk cortisol milk fatty acids grazing animals Holstein dairy cows omega-3 fatty acids |
| url | https://www.mdpi.com/2076-2615/11/11/3122 |
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