Short communication: influence of dietary tallow and fish oil on milk fat composition.
Four midlactation Holstein cows in a 4 x 4 Latin square design were fed one of four diets that contained 3% added fat (dry matter basis) as 100:0, 67:33, 50:50, or 33:67 tallow:fish oil. Feed intake and yield and composition of milk were not affected by treatment. The proportion of fatty acids 18:0 and cis-18:1 decreased and trans-18:1, conjugated linoleic acid, 18:3, 20:4, and 20:5 increased in milk fat with increasing fish oil. The efficiency of transferring dietary 20:5 and 22:6 to milk fat was < 7%.
Jones
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DF
Department of Animal Sciences, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 44691, USA.
Weiss
W P
WP
Palmquist
D L
DL
D000821:Animal Feed; D000818:Animals; D002417:Cattle / Q000502:physiology*; D004041:Dietary Fats / Q000008:administration & dosage*; D005223:Fats / Q000008:administration & dosage*; D005227:Fatty Acids / Q000032:analysis*; D005260:Female; D005395:Fish Oils / Q000008:administration & dosage*; D007774:Lactation; D019787:Linoleic Acid; D008055:Lipids / Q000032:analysis / Q000737:chemistry; D008892:Milk / Q000737:chemistry*; D008894:Milk Proteins / Q000032:analysis
D004041:Dietary Fats; D005223:Fats; D005227:Fatty Acids; D005395:Fish Oils; D008055:Lipids; D008894:Milk Proteins; C013698:tallow; D019787:Linoleic Acid