Seymour Dave J, Winia Pieter A, Uittenbogaard Gera, Carson Michelle, Doelman John
Trouw Nutrition R&D, PO Box 299, 3800 Amersfoort AG, the Netherlands.
Animal Nutrition Group, Wageningen University & Research, PO Box 338, 6700 Wageningen AH, the Netherlands.
J Dairy Res. 2023 Jan 12:1-3. doi: 10.1017/S0022029922000851.
This research communication reports the responses to supplementing dairy cattle with a hydrogenated fat-embedded calcium gluconate feed additive. The role of hindgut health in ruminant performance and wellbeing is an area of growing interest. Various prebiotic compounds have been used to promote lower gut health in various non-ruminant species. Calcium gluconate, a prebiotic compound, has previously been observed to increase milk fat yield when fed to ruminants in a form capable of resisting fermentation in the rumen, though the mechanism(s) behind this response remain unclear. The objective of this study was to compare the responses of lactating cattle to two different supplementation levels of a hydrogenated fat-embedded calcium gluconate (HFCG) product to evaluate a potential linear dose response. Forty-six lactating Holstein dairy cattle were used in a 3 × 3 replicated Latin square design with 28 d periods to evaluate a previously used dose of HFCG (approximately 16 g/d) with both a negative control and a dose of 25 g/d. Supplementation of multiparous animals with 16 g/d HFCG significantly ( < 0.05) increased milk fat yield and content relative to the negative control, and subsequently improved gross feed efficiency ( < 0.05); additionally, the presence of a potential non-linear dose response was observed for these parameters. Responses when supplemented with 25 g/d HFCG did not differ from the negative control. No production responses were observed in primiparous animals. The mode of action of HFCG, in addition to the potential differential response in primiparous animals remains unclear and warrants further investigation.
本研究通讯报道了给奶牛补充氢化脂肪包埋葡萄糖酸钙饲料添加剂的效果。后肠健康在反刍动物生产性能和健康方面的作用是一个日益受到关注的领域。各种益生元化合物已被用于促进不同非反刍动物的肠道健康。葡萄糖酸钙是一种益生元化合物，以前观察到，以能够抵抗瘤胃发酵的形式喂给反刍动物时，它会增加乳脂产量，不过这种反应背后的机制尚不清楚。本研究的目的是比较泌乳奶牛对两种不同添加水平的氢化脂肪包埋葡萄糖酸钙（HFCG）产品的反应，以评估潜在的线性剂量反应。46头泌乳荷斯坦奶牛采用3×3重复拉丁方设计，每期28天，以评估之前使用的HFCG剂量（约16克/天），同时设置一个阴性对照和一个25克/天的剂量。与阴性对照相比，给经产动物补充16克/天的HFCG显著（<0.05）提高了乳脂产量和含量，随后提高了总饲料效率（<0.05）；此外，观察到这些参数存在潜在的非线性剂量反应。补充25克/天HFCG时的反应与阴性对照没有差异。初产动物未观察到生产反应。HFCG的作用方式，以及初产动物中潜在的差异反应仍不清楚，值得进一步研究。
