Ratio « number of males on number of females » for the mass production of Sarotherodon melanotheron’s fry in concrete tanks | JBES 14(1), 72-81

By: Chikou Antoine

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The appropriate proportion of male and female parents that give a highest number of juveniles is a major concern in tilapia culture Sarotherodon melanotheron due to the oral incubation by males. A study of the ratio “number of males to number of females” on fingerlings production has been performed in order to determine the optimal ratio for S. melanotheron.

Five ratios were tested : R1 (1 male to 2 females), R2 (1 male to 3 females), R3 (2 males to 2 females), R4 (2 males to 4 females) and R5 (2 males to 6 females). The experimental device consists of five concrete tanks (1m x 1m x 60cm) filled to 2/3, about 0.17m³ of water. The fish are fed three times a day with a diet containing 35% crude protein. Once a week, the fertilized eggs are collected and incubated in a tank. The hatching rate and larval growth are followed. The experiment was duplicated and lasted 6 weeks to harvest eggs and 40 days to track the growth of larvae. The results show that the number of egg laying is significantly different from a ratio to each other (p ˂ 0.05) and increases with the number of males and females. The highest number of egg laying is obtained with R5 ratio “2 males to 6 females” that seems best for the mass reproduction of juveniles of S. melanotheron. These results provide a basis for the intensive production of S. melanotheron for the aquaculture development in lagoon. Full articles at: J. Bio. Env. Sci. 14(1), 72-81, January 2019.

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Ratio « number of males on number of females » for the mass production of Sarotherodon melanotheron’s fry in concrete tanks from Innspub Net

Citation Sample 

Chikou Antoine. Ratio « number of males on number of females » for the mass production of Sarotherodon melanotheron’s fry in concrete tanks. J. Bio. Env. Sci. 14(1), 72-81, January 2019.
https://innspub.net/jbes/ratio-number-males-number-females-mass-production-sarotherodon-melanotherons-fry-concrete-tanks/

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Ratio « number of males on number of females » for the mass production of Sarotherodon melanotheron’s fry in concrete tanks

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Relationship among body condition score, some biochemical parameters and uterine involution in dairy cow - JBES

• N. Bouhroum*, R. Zouaghi, B. Bensahli

• Laboratory of Bioresources Natural Local, Department of Biology Sciences, University of Hassiba Benbouali, Algeria 

The objective of this study was to identify the relationship among body condition score (BCS) at the time around parturition, some indicators of biochemical status and the uterine involution.

The BCS was measured once a month and the cows were divided into groups according to their BCS at calving and after calving. The Blood content creatinine and phosphorus was measured the day of calving, 30 days and 60 days postpartum and the Blood content creatine kinase was measured the day (d) of calving, 15 days , 30 days and 45 days postpartum.

The data set was analyzed by the Student test comparison of two means using statistical program XL stat.

Cows with lower BCS at calving showed a raise blood phosphorus (88.015 mg / l) and a raise blood créatinine (15.415 mg / l) and significantly (P < 0.05) differed from those detected in cow with the highest BCS level and the cow with average BCS level.

No differences significant was found between the concentration blood creatine kinase at calving (160.70 IU) and at fifteenth days of postpartum (PP) (142.91 IU) in cow with lower BCS.

In conclusion, we can say that the lean cow use the phosphagen source to ensure the smooth progress of uterine involution after parturition

Full Article Available at: Volume 3, Number 1, January 2013 – IJB
JOURNAL NAME:   International Journal of Biosciences (IJB)

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