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ThesisItem Open Access A Comparison of some multiple trait selection methods for improving egg produciton in chickens(Punjab Agricultural University, Ludhiana, 1982) Lal, Madan; Dev, Dalbir SinghThesisItem Open Access A Comparison of different measures of part year egg production in chickens(Punjab Agricultural University, Ludhiana, 1975) Lal, Madan; Sandhu, J. S