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Effect of Changes in Body Weight,Body Condition and Back Fat During Last Month of Pregnancy on the Reproductive Efficiency of Bos indicus Cows in the Tropics of Costa Rica

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Open Journal of Veterinary Medicine 2013年第1期3卷 22-28页

作者： Jaime Galindo Carlos S.Galina Sandra Estrada Juan Jose Romero Marco Alarcon martín maquivar Escuela de Agronomía Instituto Tecnologico de Costa RicaAlajuelaCosta Rica Departamento de Reproduccion Facultad de Medicina Veterinaria y ZootecniaUniversidad Nacional Autonoma de MexicoMexico DFMexico Programa de Investigacion en Medicina Poblacional Escuela de Medicina VeterinariaUniversidad Nacional HerediaCampus Benjamín NunezLagunillaCosta Rica Department of Animal Sciences The Ohio State UniversityColumbusUSA

With the aim of evaluating how changes in the metabolic status in the last month of pregnancy affects reproductive efficiency, forty six Bos indicus multiparous cows (5.5 ± 2.4 parturitions), were used. Measurements of body weight (BW), body condition score (BCS) and dorsal back fat (BF) were taken in the last month of pregnancy, postpartum period previous to synchronization (average 50 d) and at breeding by natural mating following synchronization with a progestin (average 70 d). Average postpartum days to resumption to ovarian activity were 79.96 ± 16.5 d, and average postpartum days to conception was 88.5 ± 14 d. Days postpartum to resumption of the ovarian activity was positively correlated (0.51, P 0.01) with days postpartum to conception, also, days postpartum to conception was positively correlated with prepartum back fat (14 d before parturition) (0.44, P 0.05). It was observed that BF at calving which is an objective measurement had a low correlation with other productive variables such as BCS and BW (always less than 0.39). Body fat might be a more reliable indicator of the current metabolic status of the animal particularly in the last month of pregnancy when the indicators of BCS are somehow more difficult to interpret and subjective.

关键词： Bos indicus Cattle Body Condition Body Weight Reproduction

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Effect of the Technological Status of Small Cow-Calf Farm Producers on the Induction to Resumption of Ovarian Activity of Dual-Purpose Cattle Raised under Topical Conditions

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Open Journal of Veterinary Medicine 2020年第11期10卷 195-205页

作者： Henry Velázquez Penagos Leticia Galindo Rodríguez Manuel Barrientos Morales Carlos Salvador Galina Hidalgo martín Guillermo maquivar Linfoot Felipe Montiel Palacios Departamento de Reproducción Facultad de Medicina Veterinaria y Zootecnia UNAM CDMX México Centro de Ense&ntilde anza Investigación y Extensión en Ganadería Tropical Facultad de Medicina Veterinaria y Zootecnia Universidad Nacional Autónoma de México Martínez de la Torre Veracruz México Facultad de Medicina Veterinaria y Zootecnia Universidad Veracruzana Veracruz México Department of Animal Sciences Washington State University Pullman Washington DC USA

The aim of the present study was to evaluate the impact of the technological level in small-scale dual-purpose cow-calf Bos indicus female operations on the resumption of the ovarian activity post-partum. A total of 13 small scale dual-purpose Bos indicus × Bos taurus operations were included in this experiment and they were classified according to their technological status as: high technological status (HT), medium technological status (MT) and low technological status (LT). ninety-three mature cows were treated with either a CIDR (controlled internal drug release device) with estradiol benzoate (CIDR+EB) or alone (CIDR). At day 9 all animals received intravaginally a CIDR for nine days. At day 0, the CIDR was withdrawn and 24 hours later one dose of estradiol benzoate was administered to 51 cows (17 in HT, 17 in MT and 17 in LT), the remaining animals (n = 42) did not receive the estradiol benzoate administration (14 in HT, 13 in MT and 15 in LT). Comparisons were performed on serum progesterone concentrations after CIDR treatment. By day 7 after implant withdrawal, the proportion of cows that resume ovarian activity detected by progesterone concentration increased in all technological level farms, no statistical main effect was observed within technological level. By day 17 there was a significant main effect of technological level (P = 0.05) on the proportion of animal that resumed the estrous cycles, but neither a main effect of treatment (P = 0.97) nor an interaction between technological level and treatment (P = 0.98). Furthermore, technological level of the farm showed a tendency (P = 0.07) to affect that resume the estrous activity, and a significant effect of treatment was observed (P = 0.005) but no interaction between technological level and treatment. The proportion of cows that showed estrus was different across technological level (P = 0.02), the highest proportion of cows showing estrus regardless of treatment was in the H

关键词： Cattle Ovulation Technological Level Small Cow-Calf Farm Producers

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Effect of the Technological Status of Small Cow-Calf Farm Producers on the Induction to Resumption of Ovarian Activity of Dual-Purpose Cattle Raised under Topical Conditions

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Open Journal of Veterinary Medicine（兽医学） 2020年第11期

作者： Henry Velázquez Penagos Leticia Galindo Rodríguez Manuel Barrientos Morales Carlos Salvador Galina Hidalgo martín Guillermo maquivar Linfoot Felipe Montiel Palacios

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