1Department of Animal Science, Ilam Branch, Islamic Azad University, Ilam, Iran
2Department of Animal Science, Faculty of Agricultural Science, University of Ilam, Ilam, Iran
3Department of Animal Science, Faculty of Agricultural Science, University of Guilan, Rasht, Iran
Receive Date: 03 September 2012,
Revise Date: 11 November 2012,
Accept Date: 31 December 2012
A total of 700 day old female broiler chicks (Ross 308) were distributed into seven groupsin acompletely randomized designwith five replicates, and 20 chicks in each replicate. Dietary treatments, timeof the switch from an unsaturated sunflower oil (SFO) to a saturated tallow (T)dietary fat source, were: 1) SFO for the entire growth period (6 weeks), 2) SFO for 5 weeks followed byT for last week, 3) SFO for first 4 weeks followed byT for last 2 weeks, 4) SFO for first 3 weeks followed byT for last 3 weeks, 5) SFO for first 2 weeks followed byT for last 4 weeks, 6) SFO for first 1 week followed byT for last 5 weeks and 7) T for the entire growth period. Chicks had free access to water and experimental diets during the experimental periods.All diets werecalculated to beisocaloric and isonitrogenous. Body weight and feed intake of chicks fed different diets were recorded at 21 and 42 days. At the end of experiment (on 42 day), two birds were randomly selected from each pen and slaughtered and then breast, leg and thigh muscles and abdominal fatwere sampled to determine fatty acid profile. The SAS general linear models (GLM) procedure was used for the statistical analysis of data.There was statistically significant differences between dietary treatments for body weight, feed intake and feed conversion ratio during the period from 22 to 42 d and the entire growth period, with a higher values of body weight for chicks fed diets supplemented with SFOthroughout the entire growth period (P<0.05). The lower feed conversion ratio was observed in chicks fed T-based diet for the entire growth period. Chicks with more access to T-based diet during the feeding program had significantly higher amounts of saturated and monounsaturated fatty acids in their carcass compared to those fed SFO based diets (P<0.05). Shifting fromSFO to T diet just for a few weeks time was capable in altering the profileof fatty acids in tissues toward a moresaturatedpattern.
Bavelaar F.J. and Beynen A.C. (2003). Relationships between dietary fatty acid composition and either melting point or fatty acid profile of adipose tissue in broilers. Meat Sci. 64, 133-140. Calislar S. and Aydin R. (2006). The effect of animal bone fat on body performance and carcass characteristics in broilers. Int. J. Poult. Sci. 5(11), 1057-1060. Crespo N. and Esteve Garcia E. (2001). Dietary fatty acid profile modifies abdominal fat deposition in broiler chickens. Poult. Sci. 80, 71-80. Edwards H.M.Jr. Denman F., Abou Ashour A. and Nugara D. (1973). Carcass composition studies. 1. Influences of age, sex and type of dietary fat supplementation on total carcass and fatty acid composition. Poult. Sci. 52, 934-948. Ferrini G., Baucells M.D., Esteve-Garcı´a E. and Barroeta A.C. (2008). Dietary polyunsaturated fat reduces skin fat as well as abdominal fat in broiler chickens. Poult. Sci. 87, 528-535. Folch J., Lees M. and Stanley G.H.S. (1957). A simple method for the isolation and purification of total lipids from animal tissues. J. Biol. Chem. 226, 497-509. Ghazalah A.A., Abd-Elsamee M.O. and Ali A.M. (2008). Influence of dietary energy and poultry fat on the response of broiler chicks to heat therm.Int. J. Poult. Sci. 7(4), 355-359. Glaser K.R., Wenk C. and Scheeder M.R.L. (2004). Evaluation of pork backfat firmness and lard consistency using several different physicochemical methods. J. Sci. Food Agric. 84, 853-862. Hrdinka C., Zollitsch W., Knaus W. and Lettner F. (1996). Effects of dietary fatty acid pattern on melting point and composition of adipose tissues and intramuscular fat of broiler carcasses. Poult. Sci. 75, 208-215. Leeson S. and Atteh J.O. (1995). Utilization of fats and fatty acids by turkey pullets. Poult. Sci. 74, 2003-2010. Metcalf L.D., Schmitz A.A. and Pelka J.R. (1966). Rapid preparation of fatty acid ester from lipids for gas chromatographic analysis. Anal. Chew. 38, 514-515. Olomu J.M. and Baracos V.E. (1991). Influence of dietary flaxseed oil on the performance, muscle protein deposition and fatty acid composition of broiler chicks. Poult. Sci. 70, 1403-1411. Peebles E.D., Zumwalt C.D., Doyle S.M., Gerard P.D., Latour M.A., Boyle C.R. and Smith T.W. (2000). Effects of dietary fat type and level on broiler breeder performance. Poult. Sci. 79, 629-639. Pesti G.N., Bakalli R.I., Qiao M. and Sterling K.G. (2002). A comparison of eight grades of fats as broiler feed ingredients. Poult. Sci. 81, 382-390. Sanz M., Flores A. and Lopez-Bote C.J. (2000). The metabolic use of energy from dietary fat in broilers is affected by fatty acid saturation. Poult. Sci. 41, 61-68. SAS Institute. (1996). SAS®/STAT Software, Release 6.11. SAS Institute, Inc., Cary, NC. Scaife J.R., Moyo J., Galbraith H., Michie W. and Campbell V. (1994). Effect of different dietary supplemental fats and oils on the tissue fatty acid composition and growth of female broilers. Br. Poult. Sci. 35, 107-118. Villaverde C., Baucells M.D., Cortinas L. and Barroeta A.C. (2006). Effects of dietary concentration and degree of polyunsaturation of dietary fat on endogenous synthesis and deposition of fatty acids in chickens. Br. Poult. Sci. 47, 173-179. Walker P., Rhubart-Berg P., Mc Kenzie1 S., Kelling K. and Lawrence R.S. (2005). Public health implications of meat production and consumption. Public. Health. Nutr. 8(4), 348-356. Wiseman J. and Salvador F. (1991). The influence of free fatty acid content and degree of saturation on the apparent metabolizable energy value of fats fed to broilers. Poult. Sci. 70, 573-582. Wongsuthavas S., Terapuntuwat S., Wongsrikeaw W., Katawatin S., Yuangklang C. and Beynen A.C. (2008). Influence of amount and type of dietary fat on deposition, adipocyte count and iodine number of abdominal fat in broiler hickens. J. Anim. Physiol. Anim. Nutr. 92, 92-98.