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Abstract 6- SUMMRY The following lines sUlllllerize the vl:1rious topics which we re han die din the pre sen tin v es ti gtit ion in vol ve d stu dyin g the effect of different supplementtiry dietary fats on fats aud fat soluble vitl:1mins of Hubbl:1rd und Arbo Acer broilers. Skin u nd ab dornina I I a t In two different broiler strains Le. Hubb a rd and Arbor Acer were extracted u s i ng chloroform-methanol (2: 1) at 5 au d 7 weeks age. The obtained datu showed thut Doth body weight , percentage of skin and abdominttl fats were affected by the t Y pea ndIe vel 0 f die tar y flit sup i? I ernen t sin ea c h me a I and female of Hubbard chicken at 5 and 7 weeks age. It was noticed that the s upp lernen t a I diet with (9 % ACS) decreased body weight in male and fenmle but the pere en tag e of skin and abdominal fat showed a slight increase comparing wi th the control diet. On the other hl:ind, body weight, the percentl:ige of skin and tlbdominal fat of broilers fed (!:l % HVO) were inereased than the b r0 iIe r fed wit h can t rold ie tor fed die t sup P 1ernen ted wit h (9 % ACS). - 91 - Addi tion of (6 % ACS +~~bHVO) showed a decre~ se in both body weight ~nd carcass weight, while the percentage of skin and abdominal fl:1tsincreased than the control diet. On the other hand, when the percentage of ACS decreased and the percentage of HV0 increased in supp Iernentar y die tar y fat i .e .( 3 % ACS + 6 96 HVO ) body weight and carcass weight decreased while the percentage of skin and abdominal fats were increased than the control diet. It was no ticed tha t add it ion of ( 9 % RVO ) to the diet had better effect on broilers which increased both body wiehgt and carcass weight at 7 weeks age Also, the percentage of skin fl:1tfound to increase from 1.14 and 1.83 % to 2.79 and 3.15 %, and the abdominu l flit increased from 1.52 and 1.~6 % to 2.57 and 2.73% iTlboth mule and female respectively. The addition of (9 % ACS) to the diet of both male and female of the Arbor Acer broiler chickens at 5 and 7 weeks age resulted a decrease in body weight but it caused a slight increase in the percentage of skin and abdominal fat. On the other ha nd , add i tion of (9 % HVO) found to increase body weight, carcass weight and percentag e 0 f ski nun dab dam inH I fat s than ;J r0 i1e r fed the con - trol diet or diet supplemented with (ACS). Diet containing -- ----- - 92 - (9 % ACS) affected growth rate rruchrmre than the con tr0 I die t due to the presence of the toxic level of gossypol in the die t . A lso , h igh tie vel 0 f ACS inth e die t (9 % ACS) or (6 % ACS + 3 % RYO) depressed fed con sum.pt ion and growth rate. The obtained data showed that. breed, sex, age and dietary fat have been found to lIlfluence body weight, carcass weight and the percentage of skin and abdaninal fat. Hubbard broiler chickens was higher body weight, carcass weight, percentage of skin and abdominal fat than Arbor Acer broiler in the two ages in each males and f ernales , Males are higher in body weight, carcass weight than females, but lower in skin and abdornina I fat. The physical properties of chicken fat which included the specific gravity, refractive index and melting point were studied. The specific gravity and refractive index of chicken fat showed that breed, sex and age did not showed a ~1p.Rr differences while, dietary fat caused differences in the specific gravity and the refractive index of the two different broiler strains under investigation. Both values were higher when ( 9 % ACS ) were fed than those values in broilers fed the control diet or 9 % HYO. On the other - 93 - hand, addition of (9 % ACS) to the diet caused a decrease in chicken fat melting point~ The chernica I pro per ties 0 f ski nan dab dom init I fat from the two different strains under in ve st ig at i on were studied. The acid value of chicken fat fed diet with ACS was nearly as that of the values in broilers fed the control diet. Addition of HVO to the diet caused a decrease in the acid value of both skin and abdominal fat. Addition of (9 % ACS) to the diet reflected an increase in the iodine value of skin and abdominal fat in each male and female broilers. The adifferent dietary fat supplements caused widely differences in the saponification value of chicken fat under investigation. The addition of (9 % HVO) to the diet lead to decrease the unsaponifiable matter from 0.88 and 1.89 %) in skin and abdominal fat of the control to(0.82 and 0.70 %) of the male Hubbard broilers at 7 weeks age, respectively. As well as, Arbor Acer strain showed the same trend of the unsaponifiable matter. The per 0 x ide val ue f0 Und to in crea se from (2. 6 and 2.6) to (5.3 and 5.7) in skin and abdominal fat respectively - 94 - from male HUbbard broilers at 7 weeks age when fed diet with (9 % ACS). On the other hand, addition of (9 % HVO) to the diet decreased the peroxide vulue than broilers fed diet with (ACS). The fat supplements (basal, ACS and HVO) differ mainly in the level of saturated and unsaturated fatty acids. Palmitic acid is higher in ACS and HVO than the control diet (23.74, 24.27 and 15.03 %, respectively). Linoleic acid is the main unsaturated fatty acid in control diet and ACS (41.31 and 47.48%I1:-espectively), while oleic acid was the main unsaturated fatty acid (47.01 %) in HVO. The fatty acids composition of skin and abdominal fat from male Hubbard broilers tit 7 weeks age were investigated. Results showed that the fatty acid distribution in the abdominal adipose tissues was very similar to that of the skin. Addi tion of (ti 96 ACS) to the diet showed an increase in total percent of the unsaturated fatty acids in each skin and abdominal fat than the control, (from 61.65 to 66.32 % and from 61.57 to 65.16 %, respectively). On the contrary addition of (9 % HVO) to the diet decreased total percentage of unsaturated fatty acids to reach 59.65 and 5t1.14 % in skin and abdominal fat respectively. -_ .. __.._------- - 95 - Palmitic and palmitoleic acids decreased by the addition of ACS and HVO to the diet. Palmitic acid decreased from 6.44 and 6.85 % in skin and abdominal fat to reach 4.51 and 4.08 %in broilers fed diet with 9 % ACS and 5.39 and 5.24 % in broilers fed diet with 9 % HVO. On the contrary linoJeic acid increased’ by the addition of 9 % ACS (from 12.95 and 11.65 to 21.45 and 20.03%) while addition of 9 % HVO to the diet showed a slight increase in linoleic acid to 14.94 and 14.54 % in skin and abdominal fat respectively. 4- C-h-i-c-k-e-n---f-a-t--s-o-l-u-b-le---v-i-t-a-m-i-n-s:-- soluble vitamins: B- carotene content of skin and abdominal fat from Hubbard broilers at 7 weeks age showed a slight decrease by the addition of 9 % ACS, but a higher decrease was noticed by the addition of 9 % HVO. Vitamins A and E concentration in skin and abdominal fat were affected by the addition of fat to the diet. Addition of 9 % ACS to the diet s.howed a slight dec - rease in the content of vitamins A and E than broiler fed the control diet. Whereas,addition of HVO found to decrease vitwmins A and E contents. Also, mixing ACS and HVO showed a decrease in B-carotene content and vit~mins A &nd E Gf - 96 - both skin and abdominal fat. The obtained results showed that sex is a limiting factor for the concentration of vi tamins A and E in Hubbard broiler strains. Vitamins A and E were found with higher contents in male skin and abdominal fat than in female. soluble vitwnins : B- carotene slightly decreased in skin and abdominal fats by the addition of (9 % ACS) or the addition diet wit h mix i ng (6 % ACS + 3 % HVO) tot he die tin rna Ie and female Arbor Acer broilers at 7 weeks age. Whereas. addition of (9 % HVO) to the diet showed a decrease in B-carotene content in males only. On the other hand, v i t arni ns A and E concentrations ins kin and abdomi na I fat showed mar e pronounced decrease with different dietary fat treatments than B-carotene . Whereas, the effect of addi t ion diet of (6 % ACS + 3 % HVO) or (3 % ACS + 6 % HVO) on vi t arnins A and E contents in skin and abdominal fat were nearly similar. The obtained data showed that fat soluble vitamins were found in Hubbard broiler strain with a higher content than Arbor Acer broiler strain. Also, vitamins E content was observed in skin fat more than abdominal fat ------------------ from males and females of the different broiler strains under investigation i.e. (60.52 and 58.16 ug/ g) in males and females skin fat respectively. While the abdominal fat contained (48.19 and 46.28 ugl g) in males and females respectively in Hubbard broiler at 7 weeks age fed with the control diet. Moreover, fat soluble vitamins tended to increase with increasing age. |