South African Journal of Animal Science On-line version ISSN 2221-4062 Print version ISSN 0375-1589
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SHAFEY, T.M.; HUSSEIN, E.O.S. and AL-BATSHAN, H.A..Effects of ultrasonic waves on eggshell strength and hatchability of layer-type breeder eggs. S. Afr. j. anim. sci. [online]. 2013, vol.43, n.1, pp.56-63.
ISSN 2221-4062.