Hanssen I, Ness J
Acta Vet Scand. 1982;23(3):456-65. doi: 10.1186/BF03546797.
Willow ptarmigan chicks were reared during 8 years on concentrates supplemented with blueberry plants. Mortality during the first 3 weeks after hatching ranged between 33 and 65 %, and was mainly caused by enteritis and digestive tract obstructions. The annual variations in chick survival seemed to be caused by the variations in plant phenology. The survival was highest when spring and blueberry plant development was late, and lowest when spring was early and warm, leading to early lignification of blueberry plant leaves.
柳雷鸟雏鸟在8年时间里以添加了蓝莓植株的浓缩饲料饲养。孵化后头3周的死亡率在33%至65%之间,主要由肠炎和消化道梗阻引起。雏鸟存活率的年度变化似乎是由植物物候变化导致的。当春季和蓝莓植株发育较晚时,存活率最高;而当春季来得早且温暖,导致蓝莓植株叶片过早木质化时,存活率最低。