Biomaterial Database

Milk composition, ruminal characteristics, and nutrient utilization in dairy cows fed partially hydrogenated tallow. 1993

J K Drackley, and J P Elliott

Department of Animal Sciences, University of Illinois, Urbana 61801.

Four Holstein cows (84 DIM) were used in a 4 x 4 Latin square with 21-d periods to determine the effects of increasing amounts of partially hydrogenated tallow in the diet. Tallow replaced ground shelled corn at 0, 2, 4, or 6% of total DM; diets contained 3.3, 5.1, 7.3, and 9.0% total fatty acids. Feces and urine were collected during d 16 to 21 of each period. Milk production (31.1, 31.7, 34.6, and 32.8 kg/d), milk fat content, and DMI (21.2, 20.8, 22.2, and 21.5 kg/d) were not significantly different among diets supplemented with 0, 2, 4, or 6% tallow. Tallow decreased contents of CP and SNF in milk but increased production of NPN. Percentages of short- and medium-chain fatty acids in milk fat decreased linearly, whereas percentage of C18:1 increased with increasing dietary tallow. Ruminal pH, concentrations of total VFA and NH3 N, molar percentages of VFA, and acetate to propionate ratio did not differ among treatments. Total tract apparent digestibilities of DM, OM, NDF, ADF, cellulose, hemicellulose, ether extract, energy, and soluble residue did not differ among treatments. Digestibility of total fatty acids decreased in diets containing tallow. Increasing tallow linearly increased N apparently absorbed, but utilization of energy and N was not significantly different among treatments. Partially hydrogenated tallow included at 6% or less of dietary DM did not adversely affect DMI, digestibilities, or ruminal fermentation characteristics.

UI	MeSH Term	Description	Entries
D007774	Lactation	The processes of milk secretion by the maternal MAMMARY GLANDS after PARTURITION. The proliferation of the mammary glandular tissue, milk synthesis, and milk expulsion or let down are regulated by the interactions of several hormones including ESTRADIOL; PROGESTERONE; PROLACTIN; and OXYTOCIN.	Lactation, Prolonged,Milk Secretion,Lactations, Prolonged,Milk Secretions,Prolonged Lactation,Prolonged Lactations
D008892	Milk	The off-white liquid secreted by the mammary glands of humans and other mammals. It contains proteins, sugar, lipids, vitamins, and minerals.	Cow Milk,Cow's Milk,Milk, Cow,Milk, Cow's
D009584	Nitrogen	An element with the atomic symbol N, atomic number 7, and atomic weight [14.00643; 14.00728]. Nitrogen exists as a diatomic gas and makes up about 78% of the earth's atmosphere by volume. It is a constituent of proteins and nucleic acids and found in all living cells.
D002417	Cattle	Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor.	Beef Cow,Bos grunniens,Bos indicus,Bos indicus Cattle,Bos taurus,Cow,Cow, Domestic,Dairy Cow,Holstein Cow,Indicine Cattle,Taurine Cattle,Taurus Cattle,Yak,Zebu,Beef Cows,Bos indicus Cattles,Cattle, Bos indicus,Cattle, Indicine,Cattle, Taurine,Cattle, Taurus,Cattles, Bos indicus,Cattles, Indicine,Cattles, Taurine,Cattles, Taurus,Cow, Beef,Cow, Dairy,Cow, Holstein,Cows,Dairy Cows,Domestic Cow,Domestic Cows,Indicine Cattles,Taurine Cattles,Taurus Cattles,Yaks,Zebus
D004063	Digestion	The process of breakdown of food for metabolism and use by the body.
D004734	Energy Metabolism	The chemical reactions involved in the production and utilization of various forms of energy in cells.	Bioenergetics,Energy Expenditure,Bioenergetic,Energy Expenditures,Energy Metabolisms,Expenditure, Energy,Expenditures, Energy,Metabolism, Energy,Metabolisms, Energy
D005223	Fats	The glyceryl esters of a fatty acid, or of a mixture of fatty acids. They are generally odorless, colorless, and tasteless if pure, but they may be flavored according to origin. Fats are insoluble in water, soluble in most organic solvents. They occur in animal and vegetable tissue and are generally obtained by boiling or by extraction under pressure. They are important in the diet (DIETARY FATS) as a source of energy. (Grant & Hackh's Chemical Dictionary, 5th ed)
D005227	Fatty Acids	Organic, monobasic acids derived from hydrocarbons by the equivalent of oxidation of a methyl group to an alcohol, aldehyde, and then acid. Fatty acids are saturated and unsaturated (FATTY ACIDS, UNSATURATED). (Grant & Hackh's Chemical Dictionary, 5th ed)	Aliphatic Acid,Esterified Fatty Acid,Fatty Acid,Fatty Acids, Esterified,Fatty Acids, Saturated,Saturated Fatty Acid,Aliphatic Acids,Acid, Aliphatic,Acid, Esterified Fatty,Acid, Saturated Fatty,Esterified Fatty Acids,Fatty Acid, Esterified,Fatty Acid, Saturated,Saturated Fatty Acids
D005232	Fatty Acids, Volatile	Short-chain fatty acids of up to six carbon atoms in length. They are the major end products of microbial fermentation in the ruminant digestive tract and have also been implicated in the causation of neurological diseases in humans.	Fatty Acids, Short-Chain,Short-Chain Fatty Acid,Volatile Fatty Acid,Acid, Short-Chain Fatty,Acid, Volatile Fatty,Fatty Acid, Short-Chain,Fatty Acid, Volatile,Fatty Acids, Short Chain,Short Chain Fatty Acid,Short-Chain Fatty Acids,Volatile Fatty Acids
D005260	Female		Females