补充维生素 A 对圈养肉牛及其犊牛肝脏视黄醇浓度的影响

IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Applied Animal Science Pub Date : 2024-09-16 DOI:10.15232/aas.2024-02564
H.F. Speer , K.H. Wilke , M.E. Drewnoski
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引用次数: 0

摘要

目的我们的目的是评估在圈养系统中,从妊娠中期到泌乳早期补充维生素 A 的量对奶牛肝脏视黄醇浓度以及随后对犊牛肝脏视黄醇浓度的影响。材料与方法多胎安格斯杂交肉牛(n = 54;BCS = 6.0)处于妊娠中期(5 个月),初始体重为 578 千克(SD = ±74),按 BCS 和在圈养系统中的时间分层,并分配到栏(n = 9)。每栏分配(n = 3)以下处理:当前 NASEM(2016 年)建议(31,000 IU/d;1 倍)或当前 NASEM 建议补充维生素 A 的 3 倍(93,000 IU/d;3 倍)或 5 倍(155,000 IU/d;5 倍)。在治疗开始前 24 天以及补充维生素 A 的第 40 天和第 81 天采集奶牛肝脏活检样本,在产犊后 32 天(补充维生素 A 的第 165 天,SD = ±22)采集奶牛和犊牛样本。在奶牛肝脏视黄醇中观察到处理×日的明显交互作用。在整个研究期间(≤189 μg/g DM),1X 的肝脏视黄醇浓度一直低于足够的参考范围(300-700 μg/g DM),而 3X 和 5X 在第 81 天时已升高到足够的范围(分别为 334 和 412 μg/g DM)。不同处理的犊牛肝脏视黄醇浓度也有差异,1X母牛的犊牛肝脏视黄醇浓度低于3X和5X母牛的犊牛,但两者没有差异。1X犊牛的肝脏视黄醇浓度(51 μg/g DM)不符合32日龄犊牛的标准(100-350 μg/g DM),但3X和5X奶牛的犊牛肝脏视黄醇浓度(分别为119和165 μg/g DM)符合标准。连续165天为奶牛补充93,000 IU/天的维生素A,可使奶牛及其犊牛肝脏视黄醇浓度达到适当的参考范围。长期饲喂主要由棕色饲料和浓缩物组成的日粮的奶牛可能需要补充比目前建议更多的维生素 A,以确保犊牛从初乳中获得足够的维生素 A。
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Effects of vitamin A supplementation on liver retinol concentrations of beef cows and their calves managed in confinement

Objective

Our objective was to evaluate how the amount of vitamin A supplementation provided from mid- gestation through early lactation affected liver retinol con- centrations of a cow and, subsequently, of her calf in a confinement system.

Materials and Methods

Multiparous Angus cross beef cows (n = 54; BCS = 6.0) in mid-gestation (5 mo) with an initial BW of 578 kg (SD = ±74) were stratified by BCS and time spent in the confinement system and were assigned to pen (n = 9). Pens were assigned (n = 3) to each of the following treatments: current NASEM (2016) recommendation (31,000 IU/d; 1X) or 3 times (93,000 IU/d; 3X) or 5 times (155,000 IU/d; 5X) the cur- rent NASEM recommendation for supplemental vitamin A. Cows were limit fed a diet consisting of wheat straw, corn silage, and wet distillers grains. Liver biopsies were collected from cows 24 d before treatment initiation and at d 40 and 81 of supplementation, and both cows and calves were sampled 32 d after calving (d 165 of supplementa- tion, SD = ±22).

Results and Discussion

No differences in initial cow liver retinol concentrations (mean 186 μg/g of DM) were observed between treatments. A significant treatment × day interaction was observed for cow liver retinol. Liver retinol concentrations of 1X remained below adequate ref- erence ranges (300–700 μg/g of DM) throughout the study (≤189 μg/g of DM), whereas 3X and 5X were elevated into the adequate range by d 81 (334 and 412 μg/g of DM, respectively). Calf liver retinol concentration also differed among treatments, as calves of cows in 1X had lesser liver concentrations than 3X and 5X calves, which did not dif- fer. Liver retinol concentrations considered adequate for calves at 32 d of age (100–350 μg/g of DM) were not observed in 1X calves (51 μg/g of DM) but were observed in calves from 3X and 5X cows (119 and 165 μg/g of DM, respectively).

Implications

Providing the amount of supplemental vitamin A recommended by NASEM to cows in a long- term drylot did not result in cow or calf liver retinol con- centrations within the adequate reference ranges. Supple- menting cows with 93,000 IU/d of vitamin A for 165 d brought liver retinol concentrations of cows and their calves up within adequate reference ranges. Cows being fed diets consisting mainly of brown forages and concen- trates long term may need more supplemental vitamin A than currently recommended to ensure calves receive enough vitamin A from colostrum.

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来源期刊
Applied Animal Science
Applied Animal Science AGRICULTURE, DAIRY & ANIMAL SCIENCE-
CiteScore
3.00
自引率
6.70%
发文量
68
期刊最新文献
Table of Contents Editorial Board Call for Submissions Fabrication yields and allometric growth coefficients of carcass components of serially slaughtered implanted or non-implanted beef steers Comparison of a single extended-release implant and a re-implant strategy on performance and carcass characteristics of beef finishing heifers
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