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| Santos,FC dos; Brandão,MDM; Silva,CC da; Machado,LS; Soares,MV; Barreto,ML; Nascimento,ER do; Pereira,VLA. |
| A farm with 3,000 free-range hens between 24 and 65 weeks of age was investigated. These hens were separated in small flocks of 400 to 700 birds, presenting 10 to 23% egg production reduction. Twenty serum samples were collected during the period of drop in egg production and three weeks later for the investigation of Mycoplasma synoviae (MS), M. gallisepticum (MG) and Infectious Bronchitis Virus (IBV) antibodies using ELISA. At the time of the second collection, egg production had resumed to normal levels; however, with 10.23% of the eggs showed eggshell abnormalities limited to the apex. Eggshell strength was significantly different between normal and those with eggshell apex abnormalities, but not other egg-quality parameters. ELISA tests showed that MS... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eggs; Mycoplasm; Egg defects; Egg abnormality; Economic loss. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2014000200015 |
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| 西澤, 成寿; 窪田, さと子; 志賀, 永一; NISHIZAWA, Naruhisa; KUBOTA, Satoko; SHIGA, Eiichi. |
| 稲発酵粗飼料（以下，稲WCS）は，国内飼料自給率の向上や休耕田の解消といった利点があり，今後のわが国の農業の発展において期待されている．一方で乳量低下・疾病増加など稲WCSの品質が原因と考えられる負の影響について一部の導入農家から声が挙がっている．そこで本研究では，稲WCSを導入後乳量低下などが生じた酪農家を対象として調査を行い，月別の乳量・体細胞数の推移をみるとともに，稲WCS導入後の損失額の算出を試みた．調査の結果，搾乳牛中に“稲WCS給与牛”の割合が増加するにつれて，乳量の減少・体細胞数の増加がみられた．乳量の減少に伴う農家の損失額は年間で搾乳牛１頭当たり22〜37万円程度になった． Rice Whole-Crop Silage (RWCS) has some benefits such as the improvement of domestic self-sufficiency feed rate and the solution of fallow fields, and it has expected to be contributing to the development of Japanese agriculture in the future. On the other hand, the farmer who had introduced the RWCS considered that the RWCS causes negative effects; a decreasing in milk yield and an increasing in disease of cow. In this study, we researched on one dairy farm which... |
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Palavras-chave: 稲発酵粗飼料; 費用対効果; 経済損失; 酪農場; Rice Whole-Crop Silage; Cost and benefit; Economic loss; Dairy farm. |
| Ano: 2013 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3814 |
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