A reference I have handy is:
Bluhm, C.K. 1992. Environmental and endocrine control of waterfowl reproduction. Pp 323-364 in Batt, B.D,J., et al. Ecology and management of breeding waterfowl. Univ. Minnesota Press.
For ducks: Scott, ML, and W.F. Dean.1991. Nutrition and management of ducks. ML...