Allocating protein to reproduction in arctic reindeer and caribou.

摘要: Abstract Reindeer (Rangifer tarandus tarandus) and caribou granti) use body stores (capital) food intake (income) for survival reproduction. Intakes of low‐nitrogen (N) declined in winter increased spring (51–83 g dry matter kg−0.75 d−1). calved before regaining intake, whereas 28 d later. Body N was conserved by minimizing oxidation amino acid to urea. Maternal protein stored from early used 96% fetal growth reindeer but only 84% later‐birthing caribou. Both subspecies rely on maternal 91% the deposited neonate via milk over first 4 wk. All females lost winter, lactating continued lose while nonreproductive regained protein. Net costs lactation above maintenance were greater (110%–130%) than energy (40%–59%). Large fat spare c...