Showing 4 results for Vitamin C
ٍsayed Mohammad Hashemi, Javad Pourreza,
Volume 2, Issue 3 (10-1998)
Abstract
This experiment was carried out to study the effects of different levels of vitamin C (0, 150, 300 and 450 ppm) and cage density (3, 4 and 5 birds) on performance and egg shell quality of laying hens under high environmental temperature. In a completely randomized design with 3 × 4 factorial arrangement, one hundred and ninety two (192) 25 week white leghorn hens were divided into 48 replicates four hens per replicate. The experimental period lasted 90 days. The criteria measured were: percentage production, egg weight, egg output, feed conversion ratio, shell thickness, shell weight, shell calcium and albumin height. Daily egg production and biweekly egg weight, shell thickness, shell weight and albumin height were recorded. Shell c1acium was measured at the end of the experiment's period. The results indicate that, 150 ppm vitamin C significantly (P < 0.05) increased egg weight and shell calcium. Albumin height was significantly (P < 0.05) increased at 300 ppm vitamin C supplementation. Cage density had no effects on shell weight, thickness and calcium, and albumin height. Egg weight, egg production and egg output were reduced significantly (P < 0.05) due to increased cage density. Feed conversion ratio was also increased significantly (P < 0.05) as cage density was increased. Interactions between vitamin C and cage density on shell and egg weight were significant (P < 0.05).
A. Karimi, A. Samie, J. Pourreza,
Volume 5, Issue 2 (7-2001)
Abstract
This experiment was carried out to study the effects of supplemental Cu (0, 100 and 200 mg/kg) and vitamin C (0, 400 and 800 mg/kg) on cholesterol and other blood components in broiler chicks. A total of 360-day-old chicks in a completely randomized block design in a factorial arrangement were used. At 56 days of age one male and one female from each pen were selected, slaughtered and blood samples were collected at slaughtering time for further analysis. After separation of serum, cholesterol, fat components, Cu and vitamin C contents of serum were measured using the relevant methods.
Copper, vitamin C, cholesterol, LDL and HDL of serum were significantly (P<0.05) affected by vitamin C and Cu supplementation. Hematocrit and mortality were not significantly affected.
L. Rozbeh Nasiraei, Sh. Dokhani, M. Shahedi, R. Shokrani,
Volume 9, Issue 4 (1-2006)
Abstract
The Two cultivars of kiwi fruit, Hayward and Abbot, with the desirable quality were harvested on time from Valiabad, a region in Tonekabon (Mazanddaran Provicnce). Fruits were graded and packed in the wooden boxes, cartons and low density polyethylene (LDPE) films, the fruits were cold stored in a proper and constant conditions (T= ±0.5 & RH=90-95%) for a period of 6 months. Samples were taken in completely randomised design from each package for intervals of 30±3 days and during storage (6 months). Chemical characteristics such as the total soluble solids(TSS), titratable acidity as citric acid, dry matter, vitamin C and the Physical characteristics such as yield point (Y.P.), yield point strength (Y.P.S.), penetration force (P.F.) and penetration stress (P.S.) were measured. Statistical analysis was performed with the factorial experiment in an unequal completely randomized design and the means compaired by Duncan multiple range test. The results indicated that, cv, Abbot has shorter shelf life, 4 months, compared to Hayward with 6 months storage period. Hayward contained more dry matter than Abbot throughout the storage period. Total soluble solids of cultivars increased and titrable acidity as citric acid decreased during storage. Vitamin C of Abbot was more than Hayward throughout the storage. Total factors in relation to texture and physical properties decreased by time such texture Hayward cv.after six month storage and in Abbot after four month storage was softer. As the final conclusion, wooden bins packaging for longer storage and plastic packaging for monotonous rippening of kiwifruit was the best in compared with other packaging.
M. Yahyavi, Gh. Azari Takami, Gh. Vosoughi,
Volume 10, Issue 4 (1-2007)
Abstract
Stress tests are commonly applied in shrimp hatcheries to estimate the quality of postlarvae to be used during growout. The highest larval survival rate during culture and in shrimp stress tests has been reported when specimens are offered a diet containing high levels of highly unsaturated fatty acids ( HUFA ) . Also vitamin C has positive effect to resistance and survival of larvae . In this study in postlarvae stage 1 in the salinity stress tests (10 and 20 ppt ) the highest survival rate was observed in treatment 3 ( 56.667 % and 90.00 % ) which was enriched with highly unsaturated fatty acids and vitamin C . As for the second, treatment 2 ( 43.333 % and 76.667 % ) which was solely enriched with highly unsaturated fatty acids showed significant differences at a level of ( P < 0.05 ) with treatment 3 . The difference between these two treatments and treatment 1( larvae fed rotifers cultured on Chlorella sp. ) and control ( larvae fed newly hatched Artemia nauplii ) was also significant . No significant difference was observed in formalin stress test ( 100 ppm ) in this stage between treatments 3 ( 86.667 % ) and 2 ( 80.00 % ) which shows the highest survival rate . But difference between them with treatment 1( 60.00 % ) which was unenriched and control ( 53.333 % ) was significant . Also, in postlarvae stage 5 in the salinity stress tests (10and20 ppt) the highest survival rate was observed in treatment 3 ( 56.667 % and 83.333 % ) and later treatment 2 ( 40.00 % and 70.00 % ) which showed significant difference . In this stage , the survival rate the treatment control ( 60.00 % and 86.667 % ) and treatment 3 showed no significant difference but they showed significant differences with treatment 1 and 2 .The lowest survival rate was observed in treatment 1( 26.667 % and 56.667 % ) . And the highest survival rate was observed in formalin stress test ( 100 ppm ) in this stage in treatments control , 3 and 2 ( 76.667 % , 73.333 % and 70.00 % ) among which there were no significant differences . However, the difference between these three treatments with treatment 1 ( 53.333 % ) was significant .
