Effects of Calcium Salts of Long-Chain Fatty Acids Added to a Diet Containing Choice White Grease on Lactation Performance

J. A. Salfer, J. G. Linn, D. E. Otterby, W. P. Hansen, C. G. Soderholm

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We studied the effect of increased energy density of diets during early lactation on lactational performance of cows injected with bST. Total mixed rations contained 50% forage (DM) and 2.5% choice white grease during the first 14 wk of lactation. Thirty cows were fed diets with grease as the only supplemental fat, and 15 cows were fed grease plus 1.8% calcium salts of long-chain fatty acids. One-half of the cows fed grease and all cows fed grease plus calcium salts of long-chain fatty acids received 640 mg/28 d of sustained-release bST from 6 to 44 wk postpartum. Calcium salts of long-chain fatty acids did not increase milk yield, 3.5% FCM, or DMI during the first 14 wk postpartum or during 15 to 44 wk postpartum. Administration of bST increased milk fat concentration .4% units during the first 14 wk postpartum. Cows receiving bST had higher DMI and produced 18.5% more 3.5% FCM from 15 to 44 wk postpartum than did controls. Calcium salts of long-chain fatty acids or bST injections did not influence body condition score or BW. These data suggest that cows yielding 30 to 35 kg of milk/d during the first 14 wk of lactation may not respond to added fat over 2.5%.

Original languageEnglish (US)
Pages (from-to)2367-2375
Number of pages9
JournalJournal of Dairy Science
Volume77
Issue number8
DOIs
StatePublished - 1994

Keywords

  • CSFA
  • G
  • G with bST
  • GB
  • GB plus calcium salts of long-chain fatty acids with bST
  • GCB
  • calcium salts of long-chain fatty acids
  • choice white grease
  • choice white grease
  • fat
  • milk yield
  • somatotropin

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