Efeito de aplicação do hormônio hcg em machos de diferentes variedades de tilápia do Nilo Oreochromis Niloticus

Souza, U. N.; Felizardo, V. O.; Melo, Carlos Cicinato Vieira; Neto, Rafael Vilhena Reis; Machado, M. R. F.; Freitas, Rilke Tadeu Fonseca de

doi:10.17523/bia.v75n1p1

Cited by 3 publications

(6 citation statements)

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“…Report of Honji et al, (2017), the LH is responsible for the rupture of the cysts and spermiation, thus it is probable that the concentration increase in semen of separated tilapias may be related to hormonal induction associated with high concentrations of FSH and LH. However, Honji et al, (2017) & Souza et al, (2018 quote that the increase of serum concentrations of FSH e LH would act increasing the spermatic concentrations, what was demonstrated in this study.…”

Section: Discussionmentioning

confidence: 38%

“…Regarding the quantity of normal spermatic cells or integrity found in this work, the values reflect the normal progression of spermatogenesis. Souza et al, (2018) found 50% of normal cells for the specie, without hormonal induction. Our integrity findings of spermatozoa are within the limits for the use artificial fertilization of fish.…”

Section: Discussionmentioning

confidence: 93%

“…For motility and semen integrity there was no significant differences for the environment, induction and days. This parameter is used to evaluate the spermatic quality and is directly related to spermatic motility (SOUZA, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…After 21 experimental days, taking into account they had completed 14 and 7 days, all were submitted to a period of food restriction of 24 hours. After this food restriction, half of the animals of each tank were artificially inducted with a unique dose, intramuscular injection, at the base of the dorsal fin with Human Chorionic Gonadotropin (hCG), CHORULON ® 5000 UI per gram weight of a live fish (SOUZA et al, 2018) and the other half received saline olution.…”

Section: Methodsmentioning

confidence: 99%

“…The reproductive parameters were evaluated by methodologies used by Pereira et al (2016) e Souza et al (2018).…”

Section: Methodsmentioning

confidence: 99%

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Hormonal induction and synchronization in the reproduction of nile tilapia (Oreochromis Niloticus)

Tuzine¹,

Freitas²,

Gaya³

et al. 2022

Bol. Ind. Anim.

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The present study aims to evaluate the sexual synchronization of Nile tilapia (Oreochromis Niloticus) breeding herds under different distributions and days. This study was carried out during, a period of 21 experimental days. It was conducted in a randomized block design (DBC), in a factorial scheme 2 × 2 × 3, (male and female, with and without hormone induction, and three times blocks of 7, 14 and 21 days). A total of 324 fish were used, 180 females and 144 males, previously microchipped with approximately 250 ± 12.25 g of body weight.. Each tank contained 36 animals, with every three tanks comprising a block of which were repeated in time. Each of the tanks was composed of only males, another with 12 males and 24 females separated by a glass and a screen on the bottom and the third tank with only females. In each treatment, half of the animals (male and female) were applied the hCG hormone, in a single dose at a concentration of 5 IU / gram fish live weight. The animals were evaluated at 7, 14, and 21 days. After 667 hours-degree after application of the hormone was made extrusion and spermatozoa by celomatic massage. It was observed females that showed ease of extrusion of gametes. For the females, spawning index, absolute and relative fecundity, oocyte weight per 1 g, diameters, and germinal vesicle peripheral position were evaluated; the sperm concentration, volume (ml), motility (%), duration of sperm motility (min) and integrity were evaluated in males. The data were submitted to analysis of variance at the 5% level of significance. For females at 14 days there was greater ease of extrusion when separated from males, with hormone application . The distribution influenced the spawning weight, the larger diameter, and for the diameters smaller the days and induction presented interference. In males, the days interfered in the increase in volume and duration of semen motility independent of induction and environment, and finally, the environment interfered significantly in semen concentration.

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Section: Discussionmentioning

confidence: 38%

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The reproductive parameters were evaluated by methodologies used by Pereira et al (2016) e Souza et al (2018).…”

Section: Methodsmentioning

confidence: 99%

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Hormonal induction and synchronization in the reproduction of nile tilapia (Oreochromis Niloticus)

Tuzine¹,

Freitas²,

Gaya³

et al. 2022

Bol. Ind. Anim.

Self Cite

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Performance, carcass quality, and intestinal biometry of European quail fed on kelp meal (Sargassum sp)

Oliveira

Furtado

Ribeiro

et al. 2022

Preprint

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This work aims to evaluate, at different stages, the productive performance, carcass quality, and intestinal biometry of European quails (Coturnix coturnix Coturnix), consuming diets with increasing levels of seaweed bran (Sargassum sp). A total of 240 European quail chicks (Coturnix coturnix Coturnix) were distributed in a completely randomized design, with four levels of bran inclusion (0.0, 2.5, 5.0, and 7.5%), 6 replications with 10 birds in each experimental plot. In the period from 1 to 21 days, the feed intake of the control group was higher, with lower water consumption. In the period from 22 to 42 days, feed and water consumption increased with the inclusion of seaweed, but with a reduction in weight gain. In the total period, water consumption was higher at the level of 2.5 and 7.5%, with lower consumption in the control group, with a small reduction in slaughter and carcass weight with the inclusion of bran. There was no difference (P > 0.05) in carcass quality and intestinal biometry. We recommended the inclusion of up to 7.5% of sargassum meal in the diet of European quails at all stages, without compromising its productive performance, carcass quality, and intestinal biometry.

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Rural extension and technical efficiency in the Brazilian agricultural sector

Freitas

Silva

Braga

et al. 2021

IFAM

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In this paper, we identify the effect of rural extension on the productive performance of Brazilian agricultural establishments, using technical efficiency as a measure of farm performance. The data used is drawn from the microdata of the 2006 Agricultural Census, accessed directly from the IBGE secrecy room. For this, we use an approach that combines the stochastic production frontier, considering selection bias in the adoption of rural extension (Heckman’s approach) and entropy balancing. We find that rural extension increases efficiency in the use of the productive inputs, with more technical efficiency found among adopting producers than non-adopters. When considering the differences according to farm size, an even greater effect is observed for larger producers. In addition, public rural extension generates higher technical efficiency scores than those obtained by privately-operated establishments.

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Efeito de aplicação do hormônio hcg em machos de diferentes variedades de tilápia do Nilo Oreochromis Niloticus

Cited by 3 publications

References 5 publications

Hormonal induction and synchronization in the reproduction of nile tilapia (Oreochromis Niloticus)

Hormonal induction and synchronization in the reproduction of nile tilapia (Oreochromis Niloticus)

Performance, carcass quality, and intestinal biometry of European quail fed on kelp meal (Sargassum sp)

Rural extension and technical efficiency in the Brazilian agricultural sector

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