+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Response of lactating dairy ewes to various levels of dietary calcium soaps of fatty acids

Response of lactating dairy ewes to various levels of dietary calcium soaps of fatty acids

Animal Feed Science and Technology 131(3-4): 312-332

Two experiments were completed to assess lactational effects of feeding calcium soaps of fatty acids (CSFA) to lactating sheep. In the first experiment, 50 Manchega ewes were blocked into groups,of 10 to which the treatments were applied. Ewes grazed and were supplemented indoors with hay and a concentrate. Treatments consisted of different levels of CSFA in the concentrate, being: control, 50, 100, 150 or 200 g CSFA/kg as fed. Concentrates were fed individually at fixed amounts depending on lactation period: nursing (weeks 1-4; 1.0 kg/day), and early (weeks 5-7; 1.0 kg/day), mid (weeks 8-14; 0.8 kg/day) and late milking (weeks 15-21; 0.6 kg/day). Level of CSFA did not affect milk yield, and effects on milk composition varied by lacation period. The biggest effects occurred during nursing, when milk fat content (P < 0.05) and yield (P < 0.001), as well as milk total solids content (P < 0.001) and yield (P < 0.05), increased linearly with CSFA dose. Milk fat content increased at a decreasing rate (linear and quadratic P < 0.05) with CSFA dose during milking, but milk protein content decreased (P < 0.05) linearly in mid and late (P < 0.01) lactation. Relative milk fat yield response to CSFA fat was bigger (P < 0.01) during nursing than in milking (55% and 20%, respectively) and decreased linearly (P < 0.001) with increasing CSFA feeding at the end of lactation. Findings from the first experiment were applied in a second experiment to the total mixed ration of a flock of 94 Manchega ewes.Treatments consisted of control and CSFA added (42 g CSFA/kg DM) total mixed rations. Diets were compared during mid lactation (weeks 7-16) by using a switch-back design of three periods of 20 days each (1, control; 2, CSFA; 3, control). Contents of milk fat and milk total solids, as well as their yields, increased (P < 0.05) in the CSFA diet, but milk protein did not vary. Milk from CSFA fed ewes had less saturated fatty acids (FA) and more monounsaturated FA than the control. The C14:1/C14:0 Delta(9)-desaturase index was not modified by CSFA. Overall, feeding CSFA to dairy ewes increased milk fat content and modified the FA profile of milk fat. Although FA from dietary CSFA were efficiently transferred to milk at the beginning of lactation, use of moderate amounts of CSFA is recommended, particularly at the end of lactation in order to avoid negative effects on milk protein concentration.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 012816649

Download citation: RISBibTeXText

DOI: 10.1016/j.anifeedsci.2006.06.014

Related references

Influence of dietary levels of calcium soaps of long chain fatty acids on lactational performance of dairy ewes. Journal of Dairy Science 75(Suppl. 1): 174, 1992

Supplemental dietary fat from extruded soybeans and calcium soaps of fatty acids for lactating dairy cows. Journal of dairy science 76(1): 197-204, 1993

A note on production responses of lactating ewes to calcium soaps of fatty acids. Animal Production 55(2): 288-291, 1992

Effect of giving different amounts of calcium soaps of fatty acids on performance of lactating ewes. Revista do Setor de Ciencias Agrarias 13(1/2): 111-117, 1994

Effects of feeding calcium soaps of fatty acids to lactating dairy cows. Zuchtungskunde 73(2): 139-148, 2001

Calcium soaps of olive fatty acids in the diets of Manchega dairy ewes: effects on digestibility and production. Journal of Dairy Science 80(12): 3316-3324, 1997

Milk fat depression and the role of trans and CLA fatty acid isomers by feeding a high fiber diet with calcium soaps of fatty acids in early lactating dairy cows. Milchwissenschaft 57(9-10): 518-522, 2002

Reproductive performance of dairy ewes fed diets containing calcium soaps of long chain fatty acids with or without DL-methionine during matting in the summer. Journal of Dairy Science 77(Suppl. 1): 351, 1994

Effects of feeding whole oilseeds to partially replace calcium soaps of fatty acids on dairy ewes intake and milk production and composition. Journal of Dairy Science 81(Suppl. 1): 302, 1998

Changes in milk fat in response to dietary supplementation with calcium salts of trans-18:1 or conjugated linoleic fatty acids in lactating dairy cows. Journal of Dairy Science 87(11): 3836-3844, 2004

Effects of somatotropin and dietary calcium soaps of fatty acids in early lactation on milk production, dry matter intake, and energy balance of high-yielding dairy cows. Journal of Dairy Science 83(9): 2085-2094, 2000

Calcium soaps of fatty acids with varying unsaturation as fat supplements for lactating cows. Canadian Journal of Animal Science 64(Suppl.): 240-241, 1984

Effect of feeding different levels of fatty acids or calcium soaps of fatty acids on digestion and metabolizable energy in sheep. Animal Production 50(1): 93-98, 1990

Effects of calcium soaps of fatty acids on serum hormones and lipid metabolites in Pelibuey ewes. Small Ruminant Research 26(1-2): 61-68, 1997

Effects of calcium soaps of fatty acids on milk composition, fat metabolites and reproductive performance in Pelibuey ewes. Journal of Animal Science 73(Suppl. 1): 307, 1995