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4. Some Biological Aspects and Population Parameters of the Slender Emperor Lethrinus variegatus (Family Lethrinidae) from the Gulf of Aqaba, Egypt.

Author

Mehanna, Sahar F., El-Bokhty, El-Azab A., and Hassanein, Eman M.

Subjects
FISH populations, PARAMETERS (Statistics), FISHERY management, NATURAL resources, SEXUAL maturity in fishes, EMPLOYMENT forecasting
Abstract

Egyptian fisheries including the aquaculture represent an important sector in the national economy, and it is a source of employment. All studies dealing with the stock assessment and fisheries management in Egypt confirmed the overexploitation situation for most commercial stocks leading to a serious decrease in domestic fish production from natural resources. This situation made the fisheries managers in Egypt explore new fishing areas to enhance fish production in Egypt. The present work was undertaken as a part of NIOF scientific plan about the Gulf of Aqaba fisheries and how rationally it can be exploited. Fish biology and population dynamics are fundamental for fish stock assessment and its management. Some biological and dynamical parameters of Lethrinus variegatus from the Gulf of Aqaba, Egypt were investigated to assess its exploitation status. Comparisons of age and growth characteristics recorded no significant differences (P> 0.05) between the sexes. The von Bertalanffy growth parameters for pooled data were K= 0.51/year, L8= 25.79cm TL and t0= -0.387 year. The mean size at which the fish attained sexual maturity for L. variegatus was 16.33cm TL. The mean size at first capture was 17.31cm, which was greater than the size at first sexual maturity, indicating the healthy status of L. variegatus stock in the Gulf of Aqaba. The fishing mortality rate for L. variegatus (0.80/yr) was substantially greater than the target Fopt (0.51/yr) and limit Flimit (0.67/yr) estimates. The slender emperor stock was in its optimum situation as the current exploitation rate was 0.44/yr. The results of the study are important to fisheries management authorities in the region since they will contribute to planning the regional fishery management policies in Egypt. [ABSTRACT FROM AUTHOR]

Published
2023

5. Efficiency of GnRH-Loaded Chitosan Nanoparticles for Inducing LH Secretion and Fertile Ovulations in Protocols for Artificial Insemination in Rabbit Does

Author

Hassanein, Eman M [0000-0003-2572-960X], Hshem, Nesrein M [0000-0003-0058-9671], Gonzalez-Bulnes, Antonio [0000-0002-0917-4475], Hassanein, Eman M, Hashem, Nesrein M, El-Azrak, Kheir El-Din M, González De Bulnes, Antonio, Hassan, Gamal A, Salem, Mohamed H, Hassanein, Eman M [0000-0003-2572-960X], Hshem, Nesrein M [0000-0003-0058-9671], Gonzalez-Bulnes, Antonio [0000-0002-0917-4475], Hassanein, Eman M, Hashem, Nesrein M, El-Azrak, Kheir El-Din M, González De Bulnes, Antonio, Hassan, Gamal A, and Salem, Mohamed H

Abstract

Gonadotropin-releasing hormone (GnRH)-loaded chitosan nanoparticles (GnRH-ChNPs) were used at different doses and routes of administration to induce ovulation in rabbits as an attempt to improve artificial insemination (AI) procedures and outcomes. In this study, the characteristics (size, polydispersity, loading efficiency, and zeta-potential) of GnRH-ChNPs and the GnRH release pattern were determined in an in vitro study. A first in vivo study assessed the pituitary and ovarian response to different GnRH-ChNPs doses and routes of administration (two i.m. doses, Group HM = 0.4 µg and Group QM = 0.2 µg, and two intravaginal doses, Group HV = 4 µg and Group QV = 2 µg) against a control group (C) receiving bare GnRH (0.8 µg). The HM, QM, and HV treatments induced an earlier LH-surge (90 min) than that observed in group C (120 min), whilst the QV treatment failed to induce such LH surge. The number of ovulation points was similar among treatments, except for the QV treatment (no ovulation points). A second in vivo study was consequently developed to determine the hormonal (progesterone, P4, and estradiol, E2) profile and pregnancy outcomes of both HM and HV treatments against group C. The treatment HM, but not the treatment HV, showed adequate P4 and E2 concentrations, conception and parturition rates, litter size, litter weight, and viability rate at birth. Overall, the use of GnRH-ChNPs allows for a reduction in the conventional intramuscular GnRH dose to half without compromising fertility. However, the addition of GnRH-ChNPs to semen extenders, although successfully inducing ovulation, has negative impacts on fertility. Thus, more studies are needed to explore this point and allow further adjustments.

Published
2021

10. Efficiency of GnRH-Loaded Chitosan Nanoparticles for Inducing LH Secretion and Fertile Ovulations in Protocols for Artificial Insemination in Rabbit Does

Author

G.A. Hassan, Antonio Gonzalez-Bulnes, Eman M. Hassanein, K.M. El-Azrak, M. H. Salem, N.M. Hashem, Hassanein, Eman M, Hshem, Nesrein M, Gonzalez-Bulnes, Antonio, UCH. Departamento de Producción y Sanidad Animal, Salud Pública Veterinaria y Ciencia y Tecnología de los Alimentos, Producción Científica UCH 2021, Hassanein, Eman M [0000-0003-2572-960X], Hshem, Nesrein M [0000-0003-0058-9671], and Gonzalez-Bulnes, Antonio [0000-0002-0917-4475]

Subjects
Litter (animal), Ovulation, endocrine system, media_common.quotation_subject, medicine.medical_treatment, rabbit, Conejos - Inseminación artificial, Semen, 02 engineering and technology, Rabbit, Article, Andrology, In vivo, Estro, Conejos - Reproducción asistida, lcsh:Zoology, medicine, Nanotechnology, lcsh:QL1-991, media_common, Artificial-insemination, Lh secretion, lcsh:Veterinary medicine, General Veterinary, nanotechnology, Chemistry, Artificial insemination, 0402 animal and dairy science, Rabbits - Reproductive technology, 04 agricultural and veterinary sciences, Chitosan nanoparticles, 021001 nanoscience & nanotechnology, 040201 dairy & animal science, Estrus, Rabbits - Artificial insemination, artificial-insemination, GnRH, ovulation, lcsh:SF600-1100, Animal Science and Zoology, 0210 nano-technology, hormones, hormone substitutes, and hormone antagonists, Hormone
Abstract

Departamento de Reproducción Animal​ (INIA), Gonadotropin-releasing hormone (GnRH)-loaded chitosan nanoparticles (GnRH-ChNPs) were used at different doses and routes of administration to induce ovulation in rabbits as an attempt to improve artificial insemination (AI) procedures and outcomes. In this study, the characteristics (size, polydispersity, loading efficiency, and zeta-potential) of GnRH-ChNPs and the GnRH release pattern were determined in an in vitro study. A first in vivo study assessed the pituitary and ovarian response to different GnRH-ChNPs doses and routes of administration (two i.m. doses, Group HM = 0.4 µg and Group QM = 0.2 µg, and two intravaginal doses, Group HV = 4 µg and Group QV = 2 µg) against a control group (C) receiving bare GnRH (0.8 µg). The HM, QM, and HV treatments induced an earlier LH-surge (90 min) than that observed in group C (120 min), whilst the QV treatment failed to induce such LH surge. The number of ovulation points was similar among treatments, except for the QV treatment (no ovulation points). A second in vivo study was consequently developed to determine the hormonal (progesterone, P4, and estradiol, E2) profile and pregnancy outcomes of both HM and HV treatments against group C. The treatment HM, but not the treatment HV, showed adequate P4 and E2 concentrations, conception and parturition rates, litter size, litter weight, and viability rate at birth. Overall, the use of GnRH-ChNPs allows for a reduction in the conventional intramuscular GnRH dose to half without compromising fertility. However, the addition of GnRH-ChNPs to semen extenders, although successfully inducing ovulation, has negative impacts on fertility. Thus, more studies are needed to explore this point and allow further adjustments., This research received no external funding., 14 Pág. (This article belongs to the Collection Nanotechnology in Animal Science)

Published
2021

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