Ecosistemas y recursos agropecuarios On-line version ISSN 2007-901XPrint version ISSN 2007-9028
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VALENZUELA-JIMENEZ, Nicolás et al.16 Hours photoperiod in holstein heifers in the subtropics: Effects in development and age to first estrus. Ecosistemas y recur. agropecuarios [online]. 2015, vol.2, n.4, pp.53-67.
ISSN 2007-901X.