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Maternal supplementation of energy and protein, but not methionine hydroxy analog, enhanced postnatal growth and response to vaccination in Bos indicus-influenced beef offspring.
Journal of Animal Science ( IF 2.7 ) Pub Date : 2020-04-20 , DOI: 10.1093/jas/skaa123
Philipe Moriel 1 , Marcelo Vedovatto 1 , Elizabeth A Palmer 1 , Rhaiza A Oliveira 1 , Hiran Marcelo Silva 1 , Juliana Ranches 2 , Joao M B Vendramini 1
Affiliation  

A 2-yr study evaluated the growth and postvaccination immune response of beef calves born from heifers offered no supplementation or pre- and postpartum supplementation of sugarcane molasses + urea with or without methionine hydroxy analog (MHA). On day 0 of each year (57 ± 5 d prepartum), Brangus crossbred beef heifers (n = 36/yr; 20 to 22 mo of age) were stratified by their initial body weight (BW; 396 ± 24.1 kg) and body condition score (BCS; 5.6 ± 0.43) and randomly allocated into 1 of 12 bahiagrass (Paspalum notatum) pastures (3 heifers/pasture). Treatments were randomly assigned to pastures (4 pastures/treatment/yr) and consisted of no supplementation (NOSUP) and supplementation of sugarcane molasses + urea (7.2 kg of DM/heifer/wk) with (MOL+) or without (MOL-) fortification with 105 g/heifer/wk of MHA. Treatments were provided from 57 ± 5 d prepartum until 17 ± 5 d postpartum (day 0 to 74). On day 74, all heifer-calf pairs were combined and managed as a single group until the end of the breeding season (day 237). Calves were early weaned at 89 ± 5 d of age (day 147), limit-fed at 3.5% of BW (DM basis) in drylot until day 201, and vaccinated against respiratory disease pathogens on days 160 and 188. Prepartum BCS on day 44 did not differ (P = 0.26) between MOL+ and MOL- heifers but both groups had greater (P < 0.0001) BCS than NOSUP heifers. Plasma concentrations of l-methionine on day 44 were the greatest (P ≤ 0.04) for MOL+ heifers and did not differ (P = 0.40) between NOSUP vs. MOL- heifers. Calf birth BW did not differ (P = 0.13) among treatments. Calf average daily gain (ADG) from birth to day 201 did not differ (P ≥ 0.17) between MOL+ vs. MOL- calves, but both groups had greater (P ≤ 0.05) ADG from birth to day 201 than NOSUP calves. Calf postvaccination plasma concentrations of glucose, cortisol, and haptoglobin did not differ among treatments (P ≥ 0.13). However, plasma concentrations of IGF-1 on day 167 and the overall positive vaccine seroconversion did not differ (P ≥ 0.18) between MOL- and MOL+ calves, but both were greater (P ≤ 0.04) compared with NOSUP calves. Hence, maternal supplementation of sugarcane molasses + urea increased BCS at calving and offspring BW gain and response to vaccination against respiratory pathogens compared with no maternal supplementation. MHA inclusion into maternal supplements effectively increased maternal plasma l-methionine concentrations but did not enhance maternal BCS at calving and offspring growth and postvaccination immune response.

中文翻译:


母体补充能量和蛋白质,但不补充蛋氨酸羟基类似物,可以增强受牛影响的牛肉后代的产后生长和对疫苗接种的反应。



一项为期两年的研究评估了未补充甘蔗糖蜜 + 尿素(含或不含蛋氨酸羟基类似物 (MHA))或产前和产后补充甘蔗糖蜜 + 尿素的小母牛生下的肉牛犊的生长和疫苗接种后免疫反应。每年的第 0 天(产前 57 ± 5 天),Brangus 杂交小母牛(n = 36/年;20 至 22 月龄)根据其初始体重(体重;396 ± 24.1 kg)和身体状况进行分层评分(BCS;5.6 ± 0.43)并随机分配到 12 个 bahiagrass(雀稗)牧场中的 1 个(3 头小母牛/牧场)。处理被随机分配到牧场(4个牧场/处理/年),包括不补充(NOSUP)和补充甘蔗糖蜜+尿素(7.2公斤DM/小母牛/周),有(MOL+)或没有(MOL-)强化含 105 克/小母牛/周的 MHA。从产前 57 ± 5 天到产后 17 ± 5 天(第 0 天至第 74 天)提供治疗。在第 74 天,所有小母牛和小牛对都被合并并作为一个组进行管理,直到繁殖季节结束(第 237 天)。犊牛在 89 ± 5 日龄(第 147 天)早期断奶,在干燥处以体重的 3.5%(DM 基础)进行限制饲喂,直至第 201 天,并在第 160 天和第 188 天接种呼吸道疾病病原体疫苗。 44 MOL+ 和 MOL- 小母牛之间没有差异 (P = 0.26),但两组的 BCS 均高于 NOSUP 小母牛 (P < 0.0001)。第 44 天,MOL+ 小母牛的 L-蛋氨酸血浆浓度最高 (P ≤ 0.04),NOSUP 与 MOL- 小母牛之间没有差异 (P = 0.40)。不同处理之间,犊牛出生体重没有差异(P = 0.13)。 MOL+ 与 MOL- 犊牛从出生到第 201 天的平均日增重 (ADG) 没有差异 (P ≥ 0.17),但两组从出生到第 201 天的 ADG 均高于 NOSUP 犊牛 (P ≤ 0.05)。 犊牛接种后血浆中葡萄糖、皮质醇和结合珠蛋白的浓度在不同处理之间没有差异(P ≥ 0.13)。然而,第 167 天的 IGF-1 血浆浓度和总体阳性疫苗血清转化在 MOL- 和 MOL+ 犊牛之间没有差异 (P ≥ 0.18),但与 NOSUP 犊牛相比均较高 (P ≤ 0.04)。因此,与母体不补充相比,母体补充甘蔗糖蜜+尿素可增加产犊时的 BCS 和后代体重增加以及对呼吸道病原体疫苗接种的反应。母体补充剂中添加 MHA 可有效增加母体血浆 L-蛋氨酸浓度,但不会增强母体产犊时的 BCS、后代生长以及疫苗接种后的免疫反应。
更新日期:2020-04-20
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