2Declerck I, Dewulf J, Piepers S,et ah Sow and litter factors influencing colostrum yield and nutritional composition[J]. Animal Science, 2015,93(3): 1309-1317.
3Rooke ] A, Bland I M. The acquisition of passive immunity in the new born piglet[J]. Livestock Production Science, 2002,78:13 23.
4Quesnel H. Colostrum production by sows: Variability of colostrum yield and immunoglobulin G concentrations[J].Animal, 2011 (1) :1783 1785.
5Vadmand C N, Krogh U, Hansen C F, et al. Impact of sow and litter characteristics on colostrums yield, time for onset of lactation, and milk yield of sows[J]. Animal Science, 2015,93(5):2488 2500.