In five slaughterhouses across Switzerland, 40 calf livers were bought from the slaughter chain to determine vitamin A content. An additional investigation with ten calves fattened at the research station with 12’600 IU vitamin A per kg of feed dry matter was carried out at the same time.<br>Vitamin A concentration of the 40 slaughterhouse calf livers avveraged 381 ± IU per g of liver on a fresh matter basis. The contents ranged from 119 IU to 1’698 IU per g of liver. In comparison to an earlier survey (1’134 ± 453 IU/g liver), the vitamin A cotent in calf livers decreased considerably. the average vitamin A content in the livers of the ten calves fattened at the research station reached 257 ± 45 IU per g fresh liver. The finding supports the conclusion that a dietary vitamin A supply of 12’600 IU per kg of feed dry matter does not result in a vitamin A accumulation in the liver, wihch is undesirable from a human dietetics point of view.
Stable climate has an important impact on the respiratory health of horses. In a study on indoor climate quality, three different ventilation systems were tested.
Although milk-production oriented (MPO) cow breeds have also become established in the mountain region, farms with the dual-purpose ‘Original Simmental’ breed are proving to be economically viable, with lower costs and higher direct payments making up for lower revenues from milk.
High milk yields before drying-off increase the risk of udder infections during the dry period. An online survey highlights what drying-off methods are currently used and how farmers rate the ‘incomplete milking’ approach for reducing milk yield.