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dc.rights.licensehttp://creativecommons.org/licenses/by-nc-nd/4.0es_MX
dc.creatorNICOLAS VALENZUELA JIMENEZ-
dc.date.accessioned2018-04-10T01:39:39Z-
dc.date.available2018-04-10T01:39:39Z-
dc.date.issued2014-08-04-
dc.identifier.urihttp://ri.ujat.mx//handle/20.500.12107/1125-
dc.description.abstractBoth growth and milk production in heifer calves are stimulated by a long photoperiod, though this has not been proven yet in subtropical areas. To evaluate the effect of 16 hr of light (L16) on calves suckling (LAC) and/or pre-pubertal stages (PP) in a subtropical area, 325 calves (36 + 0.4 kg) were randomized into two groups: L16 or natural photoperiod (LNAT). At seven months of age, 198 of these calves (195 + 2 kg) were randomly assigned to L16 or LNAT. The following were determined at the beginning and end of LAC and PP stages: Weight (PC, kg), height (AC, cm), thickness of back-fat (GG, cm) and of Longissimus dorsi (LD, cm); pelvic area (AP, cm2), body condition (CC), age at first estrus, mammary gland depth (PGM, cm) and width (AGM, cm). The statistical analysis was made using ANOVA for a 2 X 2 factorial arrangement. At the end of LAC, GG was lower and LD greater in L16 animals, while, at the end of PP, L16 heifer calves had a greater PC (260 + 3 vs 250 + 3), AP (166 + 1.2 vs 153 + 1.2), LD (3.18 + 0.04 vs 2.90 + 0.04), and AGM (2.41 + 0.02 vs 2.21 + 0.02), but a lower GG (0.114 + 0.003 vs 0.139 + 0.003) as compared to LNAT heifer calves. More L16 animals (67 %) presented estrus versus LNAT (38 %)-
dc.language.isoeng-
dc.rightsinfo:eu-repo/semantics/openAccesses_MX
dc.title16 HOURS PHOTOPERIOD IN HOLSTEIN HEIFERS IN THE SUBTROPICS: EFFECTS IN DEVELOPMENT AND AGE TO FIRST ESTRUS-
dc.typeinfo:eu-repo/semantics/article-
dc.creator.idinfo:eu-repo/dai/mx/cvu/103696-
dc.subject.ctiinfo:eu-repo/classification/cti/6-
dc.subject.keywordsPhotoperiod-
dc.subject.keywordsDevelopment-
dc.subject.keywordsHeiferscalves-
dc.subject.keywordsEstrus-
dc.subject.keywordsSubtropics-
dc.creator.oneKARLA RODRIGUEZ HERNANDEZ-
dc.creator.twoJOEL HERNANDEZ CERON-
dc.creator.threeHECTOR RAYMUNDO VERA AVILA-
dc.creator.fourGREGORIO NUÑEZ HERNANDEZ-
dc.creator.fiveALEJANDRO VILLA GODOY-
dc.creator.idoneinfo:eu-repo/dai/mx/cvu/165109-
dc.creator.idtwoinfo:eu-repo/dai/mx/cvu/12661-
dc.creator.idthreeinfo:eu-repo/dai/mx/cvu/33916-
dc.creator.idfourinfo:eu-repo/dai/mx/cvu/8997-
dc.creator.idfiveinfo:eu-repo/dai/mx/cvu/217352-
Aparece en las colecciones: Vol. 2, Núm. 4 (2015)

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