Effects of heat stress and diet on milk production and feed and energy intake of Sarda ewes
Ten Sarda dairy ewes (5th-6th month of lactation; 1995 ± 353 g/d of milk yield) were divided into two isoproductive groups and fed two different diets (high and low fiber) from May 20th to June 18th 2003, to evaluate diet effects on milk yield and intake. In addition, the relationships be...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2010-04-01
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| Series: | Italian Journal of Animal Science |
| Subjects: | |
| Online Access: | http://www.aspajournal.it/index.php/ijas/article/view/1709 |
| _version_ | 1818318158019166208 |
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| author | A. Cannas G. Fois I. Peana |
| author_facet | A. Cannas G. Fois I. Peana |
| author_sort | A. Cannas |
| collection | DOAJ |
| description | Ten Sarda dairy ewes (5th-6th month of lactation; 1995 ± 353 g/d of milk yield) were divided into two isoproductive groups and fed two different diets (high and low fiber) from May 20th to June 18th 2003, to evaluate diet effects on milk yield and intake. In addition, the relationships between meteorological conditions, measured during that unusually hot period, and milk yield and quality, dry matter intake, NDF or NDL were determined, to study animal responses to heat stress. Diet did not have any significant effect on the evaluated parameters. Milk yield was reduced by 20% (0.39 kg/d per head) as minimum temperatures changed from 9-12 °C to 18-21 °C. Similar milk yield reduction was observed as mean temperature-humidity index (THI) went from 60-65 to 72- 75. As wind speed increased from 1.5-2.5 m/s to 2.5-4 m/s, milk yield increased by 10%. Milk composition was not affected by heat stress throughout the experiment except for milk somatic cell count, which was increased by high temperatures. Dry matter, fibre and net energy intake varied significantly during the trial, with consistent and marked decreases as heat load increased. |
| first_indexed | 2024-12-13T09:48:46Z |
| format | Article |
| id | doaj.art-9a7a6051d9064164b07005a14aafc3a8 |
| institution | Directory Open Access Journal |
| issn | 1594-4077 1828-051X |
| language | English |
| last_indexed | 2024-12-13T09:48:46Z |
| publishDate | 2010-04-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Italian Journal of Animal Science |
| spelling | doaj.art-9a7a6051d9064164b07005a14aafc3a82022-12-21T23:51:59ZengTaylor & Francis GroupItalian Journal of Animal Science1594-40771828-051X2010-04-0161s57757910.4081/ijas.2007.1s.577Effects of heat stress and diet on milk production and feed and energy intake of Sarda ewesA. CannasG. FoisI. PeanaTen Sarda dairy ewes (5th-6th month of lactation; 1995 ± 353 g/d of milk yield) were divided into two isoproductive groups and fed two different diets (high and low fiber) from May 20th to June 18th 2003, to evaluate diet effects on milk yield and intake. In addition, the relationships between meteorological conditions, measured during that unusually hot period, and milk yield and quality, dry matter intake, NDF or NDL were determined, to study animal responses to heat stress. Diet did not have any significant effect on the evaluated parameters. Milk yield was reduced by 20% (0.39 kg/d per head) as minimum temperatures changed from 9-12 °C to 18-21 °C. Similar milk yield reduction was observed as mean temperature-humidity index (THI) went from 60-65 to 72- 75. As wind speed increased from 1.5-2.5 m/s to 2.5-4 m/s, milk yield increased by 10%. Milk composition was not affected by heat stress throughout the experiment except for milk somatic cell count, which was increased by high temperatures. Dry matter, fibre and net energy intake varied significantly during the trial, with consistent and marked decreases as heat load increased.http://www.aspajournal.it/index.php/ijas/article/view/1709Sheep, Heat stress, Milk, Intake |
| spellingShingle | A. Cannas G. Fois I. Peana Effects of heat stress and diet on milk production and feed and energy intake of Sarda ewes Italian Journal of Animal Science Sheep, Heat stress, Milk, Intake |
| title | Effects of heat stress and diet on milk production and feed and energy intake of Sarda ewes |
| title_full | Effects of heat stress and diet on milk production and feed and energy intake of Sarda ewes |
| title_fullStr | Effects of heat stress and diet on milk production and feed and energy intake of Sarda ewes |
| title_full_unstemmed | Effects of heat stress and diet on milk production and feed and energy intake of Sarda ewes |
| title_short | Effects of heat stress and diet on milk production and feed and energy intake of Sarda ewes |
| title_sort | effects of heat stress and diet on milk production and feed and energy intake of sarda ewes |
| topic | Sheep, Heat stress, Milk, Intake |
| url | http://www.aspajournal.it/index.php/ijas/article/view/1709 |
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