فهرس المقالات dietary fat source

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  1 - Effects of the Time of the Switch from an Unsaturated (Sunflower Oil) to a Saturated (Tallow) Dietary Fat Source on Performance and Carcass Fatty Acid Profile of Broiler Chickens
  M. Ahmadi Y. Mohammadi H. Darmani Kuhi Y. Yousefi
  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 أکثر

  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. تفاصيل المقالة
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  2 - Relationship of Dietary Fat Sources with Semen Characteristics, Blood Plasma Metabolites and Scrotal Circumference in Mature Rams
  آ. رادمنش ح. درمانی کوهی آ. ریاسی
  The hypothesis of this experiment was that the various sources of dietary fat with different dietary ratios of polyunsaturated fatty acids (PUFAs) to saturated fatty acids (SFAs) would alter the reproduction parameters of mature rams. Twelve mature rams were randomly al أکثر

  The hypothesis of this experiment was that the various sources of dietary fat with different dietary ratios of polyunsaturated fatty acids (PUFAs) to saturated fatty acids (SFAs) would alter the reproduction parameters of mature rams. Twelve mature rams were randomly allotted to one of four dietary treatments in a completely randomized design. Dietary treatments were: 1) ration with 4% soybean oil (SOY-OIL), 2) ration with 8% full fat soybean (FULL-FAT), 3) ration with 4% calcium salts of soybean oil (Ca-SALT) and 4) ration with 4% tallow (TALL). All diets were kept isoenergetic and isonitrogenous and formulated to be similar in Ca and P contents, while meeting or exceeding the Cornell Net Carbohydrate and Protein System software requirements for the rams used in this study. Diets were supplied to the rams during four months (from August to late December). Semen characteristics, scrotal circumference, and concentrations of cholesterol, low-density lipoprotein(LDL), high-density lipoprotein(HDL), triglyceride and testosterone of plasma were measured at the end of the experimental period. Based on the results of this study, diets supplemented with Ca-SALT and TALL improved the health of plasma membrane, viability and sperm concentration (P<0.05). Rams supplemented with Ca-SALT had also greater volume of semen and total sperm count in ejaculate (P<0.05) which are two important factors determining the sperm quality. There was no beneficial effect for different treatments based on spermatozoa motility (P>0.05). Blood concentrations of cholesterol, LDL and HDL of rams supplemented with Ca-SALT were significantly higher than the other treatments. Concentrations of triglyceride, testosterone and scrotal circumference were not affected by the experimental treatments (P>0.05). As an overall conclusion, the results of this study have indicated the benefits for adding Ca-SALT to the diets of adult rams on their reproductive performance. تفاصيل المقالة