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Trivers' (1972) mate desertion model was tested by relating measures of reproductive effort for snail kites, Rostrhamus sociabilis, to the sex of the deserting parent. Deserters incubated, brooded and chased potential predators as frequently as did non-deserting mates. Only provisioning of nestlings differed significantly between deserters and their mates, correctly predicting which individual ...

Many conditions affect the reproductive health of the beef herd, including nutrition, bull fertility, and environmental stresses. Perhaps none have the potential to create more significant losses than infectious diseases. Infectious diseases affecting reproduction can create losses all throughout the reproductive cycle by decreasing ovulation rates, fertilization rates, embryonic survival rates...

Many conditions affect the reproductive performance of the beef herd, including nutrition, bull fertility, and environmental stresses. Perhaps none have the potential to create more significant losses than infectious diseases. Infectious diseases affecting reproduction can create losses throughout the entire reproductive cycle by decreasing ovulation rates, fertilization rates, embryonic surviv...