{"title":"低饲草日粮在饲草有限的情况下保持牛奶产量的潜力","authors":"Ariana Negreiro, Adam L. Lock","doi":"10.3168/jdsc.2023-0407","DOIUrl":null,"url":null,"abstract":"<div><p>We determined the effect of feeding diets similar in neutral detergent fiber (NDF), starch, and crude protein (CP) with different amounts of forage on the yields of milk and milk components of mid-lactation dairy cows. Thirty-two Holstein cows (132 ± 68 d in milk) were used in a crossover design with 2 consecutive 28-d periods, with sample and data collection during the final 5 d of each period. Treatment diets were (1) control diet (CON) containing high forage (55.5% diet dry matter [DM]; forage NDF 19.2% diet DM) and no supplemental fatty acids or AA; and (2) low-forage (LF) diet containing low forage (36.6% diet DM; forage NDF 12.7% diet DM), including supplemental fat (1.43% diet DM; 82% C16:0-enriched supplement) and rumen-protected methionine and lysine. Diets were balanced for similar NDF (∼30.2% diet DM), starch (∼26.7% diet DM), and CP (∼16.2% diet DM). There was no effect of treatment on milk yield, milk fat content, or body weight. Compared with CON, LF increased DM intake (30.8 vs. 31.8 kg/d), milk fat yield (1.78 vs. 1.84 kg/d), milk protein yield (1.47 vs. 1.56 kg/d), milk protein content (3.24% vs. 3.41%), energy-corrected milk (48.3 vs. 50.2 kg/d), and body condition score (3.2 vs. 3.3). Our results demonstrate that feeding a low-forage diet supplemented with a C16:0-enriched fatty acid supplement and AA increased DM intake and the yields of milk fat and protein, without changes in body weight. The effect of a low-forage diet without supplemental fatty acids and AA was not tested.</p></div>","PeriodicalId":94061,"journal":{"name":"JDS communications","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666910223001084/pdfft?md5=e2030bbe8274af6118ed42aabec6de7b&pid=1-s2.0-S2666910223001084-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Potential for low-forage diets to maintain milk production in forage-limited situations\",\"authors\":\"Ariana Negreiro, Adam L. Lock\",\"doi\":\"10.3168/jdsc.2023-0407\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>We determined the effect of feeding diets similar in neutral detergent fiber (NDF), starch, and crude protein (CP) with different amounts of forage on the yields of milk and milk components of mid-lactation dairy cows. Thirty-two Holstein cows (132 ± 68 d in milk) were used in a crossover design with 2 consecutive 28-d periods, with sample and data collection during the final 5 d of each period. Treatment diets were (1) control diet (CON) containing high forage (55.5% diet dry matter [DM]; forage NDF 19.2% diet DM) and no supplemental fatty acids or AA; and (2) low-forage (LF) diet containing low forage (36.6% diet DM; forage NDF 12.7% diet DM), including supplemental fat (1.43% diet DM; 82% C16:0-enriched supplement) and rumen-protected methionine and lysine. Diets were balanced for similar NDF (∼30.2% diet DM), starch (∼26.7% diet DM), and CP (∼16.2% diet DM). There was no effect of treatment on milk yield, milk fat content, or body weight. Compared with CON, LF increased DM intake (30.8 vs. 31.8 kg/d), milk fat yield (1.78 vs. 1.84 kg/d), milk protein yield (1.47 vs. 1.56 kg/d), milk protein content (3.24% vs. 3.41%), energy-corrected milk (48.3 vs. 50.2 kg/d), and body condition score (3.2 vs. 3.3). Our results demonstrate that feeding a low-forage diet supplemented with a C16:0-enriched fatty acid supplement and AA increased DM intake and the yields of milk fat and protein, without changes in body weight. The effect of a low-forage diet without supplemental fatty acids and AA was not tested.</p></div>\",\"PeriodicalId\":94061,\"journal\":{\"name\":\"JDS communications\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-03-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S2666910223001084/pdfft?md5=e2030bbe8274af6118ed42aabec6de7b&pid=1-s2.0-S2666910223001084-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"JDS communications\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2666910223001084\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"JDS communications","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666910223001084","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
我们测定了饲喂中性洗涤纤维(NDF)、淀粉和粗蛋白(CP)含量相似的日粮与不同量的饲草对泌乳中期奶牛的牛奶产量和牛奶成分的影响。32 头荷斯坦奶牛(产奶期为 132 ± 68 天)采用交叉设计,连续饲喂 2 期,每期 28 天,在每期的最后 5 天采集样品和数据。处理日粮为:(1)对照日粮(CON),含高饲草(55.5% 日粮干物质 [DM];饲草 NDF 19.2% 日粮 DM),不补充脂肪酸或 AA;(2)低饲草日粮(LF),含低饲草(36.6% 日粮 DM;饲草 NDF 12.7% 日粮 DM),包括补充脂肪(1.43% 日粮 DM;82% C16:0 富集补充物)以及瘤胃保护蛋氨酸和赖氨酸。日粮中的 NDF(∼30.2% 日粮 DM)、淀粉(∼26.7% 日粮 DM)和 CP(∼16.2% 日粮 DM)保持平衡。处理对产奶量、乳脂含量和体重没有影响。与CON相比,LF增加了DM摄入量(30.8 vs. 31.8 kg/d)、乳脂产量(1.78 vs. 1.84 kg/d)、乳蛋白产量(1.47 vs. 1.56 kg/d)、乳蛋白含量(3.24% vs. 3.41%)、能量校正奶(48.3 vs. 50.2 kg/d)和体况评分(3.2 vs. 3.3)。我们的研究结果表明,饲喂添加了 C16:0 脂肪酸和 AA 的低饲喂量日粮可增加 DM 的摄入量以及乳脂和蛋白质的产量,而体重不会发生变化。没有测试不添加脂肪酸和 AA 的低贮饲日粮的效果。
Potential for low-forage diets to maintain milk production in forage-limited situations
We determined the effect of feeding diets similar in neutral detergent fiber (NDF), starch, and crude protein (CP) with different amounts of forage on the yields of milk and milk components of mid-lactation dairy cows. Thirty-two Holstein cows (132 ± 68 d in milk) were used in a crossover design with 2 consecutive 28-d periods, with sample and data collection during the final 5 d of each period. Treatment diets were (1) control diet (CON) containing high forage (55.5% diet dry matter [DM]; forage NDF 19.2% diet DM) and no supplemental fatty acids or AA; and (2) low-forage (LF) diet containing low forage (36.6% diet DM; forage NDF 12.7% diet DM), including supplemental fat (1.43% diet DM; 82% C16:0-enriched supplement) and rumen-protected methionine and lysine. Diets were balanced for similar NDF (∼30.2% diet DM), starch (∼26.7% diet DM), and CP (∼16.2% diet DM). There was no effect of treatment on milk yield, milk fat content, or body weight. Compared with CON, LF increased DM intake (30.8 vs. 31.8 kg/d), milk fat yield (1.78 vs. 1.84 kg/d), milk protein yield (1.47 vs. 1.56 kg/d), milk protein content (3.24% vs. 3.41%), energy-corrected milk (48.3 vs. 50.2 kg/d), and body condition score (3.2 vs. 3.3). Our results demonstrate that feeding a low-forage diet supplemented with a C16:0-enriched fatty acid supplement and AA increased DM intake and the yields of milk fat and protein, without changes in body weight. The effect of a low-forage diet without supplemental fatty acids and AA was not tested.