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https://ri.ujat.mx/handle/20.500.12107/1125
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Campo DC | Valor | Lengua/Idioma |
---|---|---|
dc.rights.license | http://creativecommons.org/licenses/by-nc-nd/4.0 | es_MX |
dc.creator | NICOLAS VALENZUELA JIMENEZ | - |
dc.date.accessioned | 2018-04-10T01:39:39Z | - |
dc.date.available | 2018-04-10T01:39:39Z | - |
dc.date.issued | 2014-08-04 | - |
dc.identifier.uri | http://ri.ujat.mx//handle/20.500.12107/1125 | - |
dc.description.abstract | Both 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.iso | eng | - |
dc.rights | info:eu-repo/semantics/openAccess | es_MX |
dc.title | 16 HOURS PHOTOPERIOD IN HOLSTEIN HEIFERS IN THE SUBTROPICS: EFFECTS IN DEVELOPMENT AND AGE TO FIRST ESTRUS | - |
dc.type | info:eu-repo/semantics/article | - |
dc.creator.id | info:eu-repo/dai/mx/cvu/103696 | - |
dc.subject.cti | info:eu-repo/classification/cti/6 | - |
dc.subject.keywords | Photoperiod | - |
dc.subject.keywords | Development | - |
dc.subject.keywords | Heiferscalves | - |
dc.subject.keywords | Estrus | - |
dc.subject.keywords | Subtropics | - |
dc.creator.one | KARLA RODRIGUEZ HERNANDEZ | - |
dc.creator.two | JOEL HERNANDEZ CERON | - |
dc.creator.three | HECTOR RAYMUNDO VERA AVILA | - |
dc.creator.four | GREGORIO NUÑEZ HERNANDEZ | - |
dc.creator.five | ALEJANDRO VILLA GODOY | - |
dc.creator.idone | info:eu-repo/dai/mx/cvu/165109 | - |
dc.creator.idtwo | info:eu-repo/dai/mx/cvu/12661 | - |
dc.creator.idthree | info:eu-repo/dai/mx/cvu/33916 | - |
dc.creator.idfour | info:eu-repo/dai/mx/cvu/8997 | - |
dc.creator.idfive | info:eu-repo/dai/mx/cvu/217352 | - |
Aparece en las colecciones: | Vol. 2, Núm. 4 (2015) |
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