Beta-carotene does not influence fertility in beef heifers

Greenberg, L. G.; Bristol, F.; Murphy, Bruce D.; Laarveld, B.

doi:10.1016/0093-691x(86)90041-5

Cited by 10 publications

(8 citation statements)

References 13 publications

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“…BC in plasma was extracted (Brubacher and Vuilleumier, 1980) and a high-performance liquid chromatography (HPLC) method was used to determine its concentration (Stancher and Zonta, 1982;Thompson et al, 1980) as modified by Greenberg et al (1986). The apparatus consisted of a Beckman (Beckman, Fullerton, CA) isocratic HOB HPLC system with a 100 )A injector loop, a 4-6 mm i.d.…”

Section: Methodsmentioning

confidence: 99%

Beta‐Carotene supplementation of turkey diets varying in fat and retinol

Stevens

Salmon²

1989

British Poultry Science

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1. The effects of supplementary beta-carotene (BC) at 0, 1.5, 15, 150, 1500 or 15,000 mg/kg diet on performance, incidence of leg problems, tibia ash, and plasma and liver concentration of BC and retinol of poults to 4 weeks of age were studied. 2. Body weight and food intake increased with dietary BC supplementation. Incidence of leg problems was not affected but tibia ash increased with BC supplementation. Plasma and liver BC and liver retinol increased with dietary BC but plasma retinol was not affected. 3. The effects of 0, 1.5, 15 or 150 mg BC/kg in diets containing either 30 or 60 g added fat/kg and either 1.2 or 12.0 mg retinol/kg on the above properties were studied in poults to 4 weeks of age. 4. Performance was not significantly affected by dietary fat. Efficiency of utilisation of food was depressed by the higher concentration of retinol. At 3 weeks of age birds given BC had fewer leg problems and higher tibia ash values than the control birds. Liver BC and retinol and plasma BC concentration increased with dietary BC. By 4 weeks, plasma and liver BC was higher and liver retinol was lower for birds given 1.2 compared with those given 12.0 mg/kg of retinol.

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Section: Methodsmentioning

confidence: 99%

Beta‐Carotene supplementation of turkey diets varying in fat and retinol

Stevens

Salmon²

1989

British Poultry Science

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“…También se realizó un ANOVA para evaluar la influencia de los niveles de β caroteno sanguíneo sobre la preñez a los 120 días, comparando las medias a través de un test de Tukey. Greenberg et al (1986), observando que las vacas suplementadas con 625 mg de β caroteno/día tuvieron niveles plasmáticos superiores a 300 µg/dl en la tercera o cuarta semana post parto, a pesar de su disminución durante el preparto. Por otro lado Wang, et al (1987) demostraron que la suplementación con β caroteno, desde los 30 días preparto hasta los 98 días post parto, no genera ningún beneficio reproductivo en vacas Holstein alimentadas con una dieta comúnmente utilizado en los Estados Unidos.…”

Section: Análisis Estadísticounclassified

Variaciones de β caroteno en sangre de vacas lecheras durante el periodo post parto

Aguiar-Zalzano

Rojas-Bourrillón

2015

Nut. Anim. Trop.

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<p>El caroteno es el principal precursor de la vitamina A, la cual es muy importante en los procesos reproductivos e inmunológicos del animal. Durante el estudio se pudo notar que las concentraciones sanguíneas de β caroteno caen considerablemente al momento del parto, para posteriormente incrementarse de forma paulatina hasta los 90 días post parto. De igual forma se pudo notar que las vacas que presentaron una concentración sanguínea promedio de 5,87 mg/ml (587 μg/dl) tuvieron un mayor índice de preñez, si se compara con las vacas que presentaron concentraciones promedios de 4,31 mg/ml (431 μg/dl), sugiriendo una correlación entre las concentraciones de caroteno al parto sobre la instauración temprana de una gestación.</p>

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“…However, results of some feeding experiments supplying vitamin A (including β‐carotene) and/or E did not produce improvements in cow reproduction (Greenberg et al . ; Tharnish & Larson ; Kaewlamun et al . ).…”

Section: Introductionmentioning

confidence: 99%

“…Vitamin A and E are well known antioxidants in terms of their function in reproductive improvement (Atwal et al 1990;Campbell & Miller 1998;Ikeda et al 2005;Sales et al 2008) and are used as supplements. However, results of some feeding experiments supplying vitamin A (including β-carotene) and/or E did not produce improvements in cow reproduction (Greenberg et al 1986;Tharnish & Larson 1992;Kaewlamun et al 2011). There are divisions of opinion among researchers on the effects of supplying vitamin A and E for cows which do not have vitamin deficiency.…”

Section: Introductionmentioning

confidence: 99%

Plasma thiobarbituric acid reactive substances, vitamin A and vitamin E levels and resumption of postpartum ovarian activity in dairy cows

Aoki

Ohshita

Aoki

et al. 2014

Animal Science Journal

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Vitamins with antioxidative functions are commonly used as supplements to improve fertility in dairy cows. However, according to field test results uncertainty exists about the effect of these vitamins, especially in vitamin A and vitamin E, on ovarian functional activity. This study was performed to reveal the physiological characteristics of cows receiving enough feed and the ovaries of which were activated in the early postpartum period. Six of 12 primiparous cows showing the corpus luteum on 25 to 27 days after parturition were classified as early responders (PER); the remaining six were classified as late responders (PLR). Among 11 multiparous cows, nine were early responders (MER), and the remaining two were late responders (MLR). Plasma concentration of thiobarbituric acid reactive substances (TBARS) in the PER were lower than those in the PLR (P<0.01). The ratio of plasma all-trans-retinol to intake α-tocopherol or β-carotene were increased in the following order: MER

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Beta-carotene does not influence fertility in beef heifers

Cited by 10 publications

References 13 publications

Beta‐Carotene supplementation of turkey diets varying in fat and retinol

Beta‐Carotene supplementation of turkey diets varying in fat and retinol

Variaciones de β caroteno en sangre de vacas lecheras durante el periodo post parto

Plasma thiobarbituric acid reactive substances, vitamin A and vitamin E levels and resumption of postpartum ovarian activity in dairy cows

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