CLA induced milk fat depression reduced dry matter intake and improved energy balance in dairy goats

M. Baldin, R. Dresch, J. Souza, D. Fernandes, M. A.S. Gama, Kevin John Harvatine, D. E. Oliveira

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The extent to which CLA supplements inhibit milk fat synthesis is highly dependent on the amount of trans-10, cis-12 CLA reaching the mammary gland. Secondary events such as changes in milk yield, dry matter intake (DMI), body weight (BW) and energy balance (EB) may also occur depending on the magnitude of milk fat depression. This study investigated the effects of feeding a rumen unprotected CLA methyl ester supplement on milk fat yield and fatty acid (FA) profile, yield of milk and other milk components, DMI and metabolic variables in dairy goats. Twenty primiparous, non-pregnant Toggenburg goats, paired by BW, days in milk (DIM) and milk yield (MY) [2.8. ±. 0.4 (mean. ±. SEM). kg. milk/day, BW of 40. ±. 3.7. kg and 75. ±. 3 days in milk] were used in a crossover design with 14 days treatment periods and a 6 days washout. Goats were randomly assigned to the following treatments: Control (30. g/day of calcium salts of FA) or CLA [30. g/day of a rumen unprotected CLA methyl ester supplement (29.9% trans-10, cis-12 CLA)]. There was no treatment effect on BW, milk yield, or milk protein and lactose content and yield. However, compared to Control, CLA decreased milk fat content and yield by 13.9 and 13.3%, respectively, and CLA treated goats consumed 6.5% less corn silage. The CLA treatment increased the concentration of both CLA isomers (cis-9, trans-11 and trans-10, cis-12) in milk fat. The concentration of short and medium chain milk FA (C16) was decreased by CLA, while long chain FA were increased. However, the daily secretion was lower for FA of all chain lengths in CLA treated goats. Glucose and insulin were not affected by treatment, while CLA treatment decreased non esterified FA by 22.2%. The CLA treatment improved calculated EB by 0.3. Mcal/day. Overall, CLA methyl ester supplements are effective in causing milk fat depression in lactating dairy goats and improving EB, which may be used as a nutritional tool in some circumstances.

Original languageEnglish (US)
Pages (from-to)44-50
Number of pages7
JournalSmall Ruminant Research
Volume116
Issue number1
DOIs
StatePublished - Jan 1 2014

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dairy goats
Energy Intake
Goats
energy balance
dry matter intake
milk fat
Milk
Fats
milk yield
goats
body weight
esters
milk
rumen
Toggenburg
fatty acids
Fatty Acids
milk fat yield
long chain fatty acids
dairy protein

All Science Journal Classification (ASJC) codes

  • Food Animals
  • Animal Science and Zoology

Cite this

Baldin, M. ; Dresch, R. ; Souza, J. ; Fernandes, D. ; Gama, M. A.S. ; Harvatine, Kevin John ; Oliveira, D. E. / CLA induced milk fat depression reduced dry matter intake and improved energy balance in dairy goats. In: Small Ruminant Research. 2014 ; Vol. 116, No. 1. pp. 44-50.
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abstract = "The extent to which CLA supplements inhibit milk fat synthesis is highly dependent on the amount of trans-10, cis-12 CLA reaching the mammary gland. Secondary events such as changes in milk yield, dry matter intake (DMI), body weight (BW) and energy balance (EB) may also occur depending on the magnitude of milk fat depression. This study investigated the effects of feeding a rumen unprotected CLA methyl ester supplement on milk fat yield and fatty acid (FA) profile, yield of milk and other milk components, DMI and metabolic variables in dairy goats. Twenty primiparous, non-pregnant Toggenburg goats, paired by BW, days in milk (DIM) and milk yield (MY) [2.8. ±. 0.4 (mean. ±. SEM). kg. milk/day, BW of 40. ±. 3.7. kg and 75. ±. 3 days in milk] were used in a crossover design with 14 days treatment periods and a 6 days washout. Goats were randomly assigned to the following treatments: Control (30. g/day of calcium salts of FA) or CLA [30. g/day of a rumen unprotected CLA methyl ester supplement (29.9{\%} trans-10, cis-12 CLA)]. There was no treatment effect on BW, milk yield, or milk protein and lactose content and yield. However, compared to Control, CLA decreased milk fat content and yield by 13.9 and 13.3{\%}, respectively, and CLA treated goats consumed 6.5{\%} less corn silage. The CLA treatment increased the concentration of both CLA isomers (cis-9, trans-11 and trans-10, cis-12) in milk fat. The concentration of short and medium chain milk FA (C16) was decreased by CLA, while long chain FA were increased. However, the daily secretion was lower for FA of all chain lengths in CLA treated goats. Glucose and insulin were not affected by treatment, while CLA treatment decreased non esterified FA by 22.2{\%}. The CLA treatment improved calculated EB by 0.3. Mcal/day. Overall, CLA methyl ester supplements are effective in causing milk fat depression in lactating dairy goats and improving EB, which may be used as a nutritional tool in some circumstances.",
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CLA induced milk fat depression reduced dry matter intake and improved energy balance in dairy goats. / Baldin, M.; Dresch, R.; Souza, J.; Fernandes, D.; Gama, M. A.S.; Harvatine, Kevin John; Oliveira, D. E.

In: Small Ruminant Research, Vol. 116, No. 1, 01.01.2014, p. 44-50.

Research output: Contribution to journalArticle

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AU - Baldin, M.

AU - Dresch, R.

AU - Souza, J.

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AU - Harvatine, Kevin John

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