... in Original articleSelection on testis size as an indicator of maturity in growing animals. II Correlated responses in reproductive rateWG HillPJ Marks2JC Jenkins1RB Land21 ... responses in litter size and weight. J AnimSca 48, 509-516Eisen EJ (1978) Single-trait and antagonistic index selection for litter size and bodyweight in mice. Genetics 88, ... Marks PJ, Jenkins JC, Land RB (1990) Selection on testis size as an indicator of maturity in growing animals. Genet Sel Evol 22, 229-244Islam ABMM, Hill WG, Land RB (1976)...