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«Central European Journal of Zoology» – научный журнал.

E-ISSN 2500-3739

Периодичность – 1 раз в год.
Издается с 2015 года.

1 September 30, 2020


1. Ibukun Olukorede Popoola, Oluwabukola Rashidat Popoola, Ibikunle Funso Olaleru, Ibukun Oluwatobi Busari, Femi Joshua Oluwadele, Oluwaseyi Olamide Olajide
Early Thermal Acclimatization in Pre-Starter and Starter Chicks Fed Varying Crude Protein Diets Fortified with Optimum Electrolyte Balance

Central European Journal of Zoology, 2020, 6(1): 3-17.
DOI: 10.13187/cejz.2020.1.3CrossRef

The genetic potentials of fast-growing strains of broiler chickens have been compromised as a result of the huge contribution of external factors determining the expression of these useful traits. The earth`s present surface temperature has necessitated adjustments in major contributing factors to beneficial traits expression in broilers that includes nutritional balance in the face of thermal oscillation. Crude protein (CP) ingestion cause a greater increase in heat production than carbohydrates or fat. However, controversy abounds on whether or not low CP diets are beneficial to poultry raised in hot environment. It is essential to investigate the effects of heat stress acclimation during early weeks on adaptability to high endogenous heat production in broiler chicks. Using a total of 288, one day-old Arbor Acre broiler chicks, birds were randomly allotted to four dietary treatments (T1 – 23 % CP; T2 – 21 % CP; T3 – 19 % CP; and T4 – 17 % CP) with six replicates, in a completely randomized design. Data were analysed using descriptive, ANOVA, regression and correlation statistics. Pre-starter chicks cannot tolerate excess endogenous heat load from protein degradation and therefore divert dietary proteins needed for growth into regulation of homeostasis. Heat-stressed starter broiler chicks can tolerate excessive endogenous heat load at optimum DEB of 270 mEq/kg and achieve a new energy and homeostatic balance. However, production and economic prowess necessitate the adoption of 21 % CP in diets of pre-starter and starter broiler chicks under severe heat stress conditions.

URL: http://ejournal40.com/journals_n/1602194405.pdf
Number of views: 25      Download in PDF

2. Hamed H.E. Saleh
Spawning of Sole Fish and Its Larvae and Juvenile Rearing: A Review

Central European Journal of Zoology, 2020, 6(1): 18-50.
DOI: 10.13187/cejz.2020.1.18CrossRef

A number of scientific studies have investigated aspects of soles spawning and rearing of larvae and juvenile. Studies show that sole spawn readily in captivity, and the buoyant, fertilized eggs are easily collected. Stocking density during maturation should be 0.75-1.5 kg/m2, and temperature should be kept above 16°C for Solea senegalensis or between 8 and 12°C for Solea solea. The onset of spawning is related to a rise in temperature occurring at above 10°C and viable eggs are found in the temperature range of 8-12 ºC. Salinity should be kept constant around 33-35 ‰. Hormonal induction of ovulation for sole fish was successful with human chorionic gonadotropin (HCG), carp pituitary extract (CPE), luteinizing and releasing hormone analogue (LHRHa) and gonadotropin-releasing hormone agonist (GnRHa). Hatching of Solea aegyptiaca eggs occured after 48±3 h from fertilization at temperature 16-19 ºC, while occured after 60-72 h at 14-16 ºC, for wedge sole after 36-48 h at 19 ºC and within 72-96 h at 11-17 ºC for Solea solea. The growth rate for larvae has been increased gradually with increasing temperature until 20 °C then decreased. The best growth performance of larvae at photoperiods of 18 light: 6 dark and at salinity 20 ‰. Studies indicate that a mixture of inert and live food may increase the weaning success of sole fry, and this can be further enhanced by using attractants in the dry feed. Future experiments are needed to determine the ideal time to commence weaning and determine the minimum duration of this period. Studies on alternative feeding strategies are also required. Protein requirements for maximum growth of sole are ranges between 50 % and 65 % of diet. This review clearly indicates, that albeit there exists many unsolved problems, sole remains a very attractive candidate for marine aquaculture and has a very big potential for future farming.

URL: http://ejournal40.com/journals_n/1602194452.pdf
Number of views: 24      Download in PDF

full number
URL: http://ejournal40.com/journals_n/1602194463.pdf
Number of views: 26      Download in PDF

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