Milk yield and composition, body condition, rumen characteristics, and blood metabolites of dairy cows fed diet supplemented with palm oil
Tóm tắt
An addition of rumen-protected fat to the diet of cows may limit negative energy balance and/or shorten its duration, leading to increased milk production with reduced risk of metabolic disorders in dairy cows. The aim of the study was to test the effect of rumen-inert fat supplement of palm oil on milk production, milk composition, rumen characteristics, and metabolic variables of early lactating dairy cows. For this purpose, 24 Holstein-Friesian cows were divided into two equal groups and fed a corn silage-based diet, without palm oil supplementation (control) or with 300 g palm oil (Palm Fat 99, Noack & Co. GmbH, Vienna, Austria) per cow for 8 weeks starting from day 30 after parturition. Milk, rumen, and blood samples were taken three times during experiment at days 30, 58, and 86 of lactation. Body condition scores of cows were determined in the same time periods. Milk yields were measured at the morning and evening milking (600 and 1800). Milk samples were analyzed for milk fat and milk protein content. Rumen content was tested for electrochemical reaction. A native slide was prepared for microscopical examination of the rumen protozoa motility that was numerically estimated. Protozoa were counted in whole rumen contents by light microscopy. Blood samples were tested for total protein, albumin, urea, tryglicerides, cholesterol, total bilirubin, beta-hydroxybutyrate, Ca, and P. Compared with the control, palm oil supplementation resulted in an increase of the average milk yield and milk fat content. The loss in body condition was significantly lower in the group fed palm oil than in the control group. Rumen pH, total number, and motility of protozoa in the group fed palm oil were significantly higher than those in the control group. Palm oil supplementation did not influence blood metabolite concentrations except for urea and glucose which were significantly lower and Ca and cholesterol which were significantly higher in the palm oil-supplemented group. Our results indicate that supplementation with palm oil in weeks 4 to 12 postpartum spared postpartum body weight loss, increased milk yield and milk fat content, and had positive effects on rumen characteristics.
Tài liệu tham khảo
Gonzales FD, Muino R, Pereira V, Campos R, Benedito JL (2011) Relationship among blood indicators of lipomobilization and hepatic function during early lactation in high-yielding dairy cows. J Vet Sci 12:213–218
Grummer RR (2008) Nutritional and management strategies for the prevention of fatty liver in dairy cattle. Vet J 176:10–20
McNamara JP (1991) Regulation of adipose tissue metabolism in support of lactation. J Dairy Sci 74:706–719
Drackley JK, Donkin SS, Reynolds CK (2006) Major advances in fundamental dairy cattle nutrition. J Dairy Sci 89:1324–1336
Kleppe BB, Aiello RJ, Grummer RR, Armentano LE (1988) Triglyceride accumulation and very low density lipoprotein secretion by rat and goat hepatocytes in vitro. J Dairy Sci 71:1813–1822
Bobe G, Young JW, Beitz DC (2004) Invited review: pathology, etiology, prevention, and treatment of fatty liver in dairy cows. J Dairy Sci 87:3105–3124
Bertoni G, Trevisi E (2013) Use of liver activity index and other metabolic variables in the assessment of metabolic health in dairy herds. Vet Clin North Am Food Anim Pract 29:413–431
Palmquist DL, Jenkins TC (1980) Fat in lactation rations: review. J Dairy Sci: 63:1–14
Patton RS, Sorenson CE, Hippen AR (2004) Effects of dietary glucogenic precursors and fat on feed intake and carbohydrate status of transition dairy cows. J Dairy Sci 87:2122–2129
Steele W, Moore JH (1968) The digestibility coefficients of myristic, palmitic and stearic acids in the diet of sheep. J Dairy Res 35:371–381
Vazquez-Anon M, Bertics S, Luck M, Grummer RR, Pinheiro J (1994) Peripartum liver triglyceride and plasma metabolites in dairy cows. J Dairy Sci 77:1521–1528
Šamanc H, Kirovski D, Jovanović M, Vujanac I, Bojković-Kovačević S, Jakić-Dimić D, Prodanović R, Stajković S (2010) New insights into body condition score and its association with fatty liver in Holstein dairy cows. Acta Vet (Beograd) 60:525–540
Dehority BA (1984) Evaluation of subsampling and fixation procedures used for counting rumen protozoa. Appl Environ Microbiol 48:182–185
Schingoethe DJ, Casper DP (1991) Total lactational response to added fat during early lactation. J Dairy Sci 74:2617–2622
Wu ZJ, Huber T, Chan SC, Simas JM, Chen KH, Varela JG, Santos F, Fontes C, Yu P (1994) Effect of source and amount of supplemental fat on lactation and digestion in cows. J Dairy Sci 77:1644–1651
Ashes JR, Welch PV, Gulati SK, Scott TW, Brown GH (1992) Manipulation of the fatty acid composition of milk by feeding protected canola seeds. J Dairy Sci 75:1090–1096
Banks W, Clapperton JL, Ferrie ME, Wilson AG (1976) Effects of feeding fat to dairy cows receiving a fat-deficient basal diet. I. Milk yield and composition. J Dairy Res 43:213–218
Khorasani GR, de Boer G, Robinson PH, Kennelly JJ (1992) Effect of canola fat on ruminal and total tract digestion, plasma hormones, and metabolites in lactating dairy cows. J Dairy Sci 75:492–501
Kronfeld DS, Donoghue S, Naylor JM, Johnson K, Bradley CA (1980) Metabolic effects of feeding protected tallow to dairy cows. J Dairy Sci 63:542–552
Johnson JC, Utley PR, Mullinix BG, Merrill A (1988) Effects of adding fat and lasalocid to diets of dairy cows. J Dairy Sci 71:2151–2165
Christensen RA, Drackley JK, LaCount DW, Clark JH (1994) Influence of four long-chain fatty acid mixtures into the abomasum of lactating dairy cows. J Dairy Sci 77:1052–1069
Choi B, Palmquist DL (1996) High fat diets increased plasma cholecystokinin and pancreatic polypeptide, and decrease plasma insulin and feed intake in lactating cows. J Nutr 126:2913–2919
Nestel PJ, Poyser A, Hood RL, Mills SC, Willis MR, Cook LJ, Scott TW (1978) The effect of dietary fat supplements on cholesterol metabolism in ruminants. J Lipid Res 19:899–909
Abubakr AR, Alimon AR, Yaakub H, Abudllah N, Ivan M (2013) Digestibility, rumen protozoa, and ruminal fermentation in goats receiving dietary palm oil by-products. J Saudy Soc Agric Sci 12:147–154
Machmuller A, Kreuzer M (1999) Methane suppression by coconut oil and associated effects on nutrient and energy balance in sheep. Can J Anim Sci 79:65–72