Population Biology And Distribution Of The Tanaid Kalliapseudes Schubarti Mañé-garzon, 1949, In An Intertidal Flat In Southeastern Brazil.

The population biology and the spatial and temporal distribution of Kalliapseudes schubarti Mañé-Garzon, 1949, a common tanaidacean in mud flats and estuaries in southern and southeastern Brazil, was studied in the Araçá region, São Sebastião (SP), Brazil. This species showed a clustered dispersion in the area and the individuals were concentrated in the superficial sediment layer (5 cm). Higher densities of K. schubarti were recorded in areas characterized by moderately sorted fine sediment. Multiple regression analysis revealed a positive influence of the organic matter contents and a negative effect of the silt-clay contents on the abundance of K. schubarti. This species showed a marked temporal variation with very low abundance in winter and fall (March to August). Sexual dimorphism was evidenced with males being larger than females. Ovigerous females were also larger than pre-ovigerous ones. Sex ratio was skewed towards females. Seven cohorts were identified during the sampling period, the estimated longevity was 12 months, and no seasonal oscillation in growth was evidenced. The continuous reproduction, as evidenced by the presence of larval phases (manca II and neutron) and reproductive females throughout the year, and high fecundity among the tanaids associated with fast growth and limited longevity support the case for the opportunistic life strategy suggested for this species in the literature.63346947

EFEITO DA ADMINISTRAÇÃO DO HORMÔNIO CORIÔNICO GONADOTRÓFICO (hCG) NA DURAÇÃO DO CICLO ESTRAL E NA TAXA DE PRENHEZ EM BOVINOS DE CORTE

No experimento foram utilizados 62 animais da raça Charolesa e Caracú, inseminados artificialmente (IA). No 7o dia após a IA, as vacas foram divididas aleatoriamente em 2 grupos: tratado (n=32), que recebeu 2.500 UI de hCG (IM) e controle (n=30), que recebeu 1 ml de solução fisiológica estéril, (IM). O diagnóstico de prenhez foi realizado por toque retal no 45o dia após a IA. Resultados: A duração do ciclo estral diferiu (P0,05) entre o grupo tratado e controle (40,62% e 23,33%, respectivamente). Conclusões: A duração do ciclo estral dos animais tratados foi prolongada em relação aos controles (P0,05) as taxas de prenhez em bovinos de corte. Effect of human chorionic gonadotropin (hCG) on estrous cycle length and pregnancy rates in cattle Abstract In the present experiment a total of 62 cows of Charoles and Caracú breeds, artificially inseminated (AI). At day 7th after AI the cows were aleatory distributed in two groups: treated group (n=32) that receive 2.500 UI of human chorionic gonadotropin (hCG) by the intramuscular route and control group (n=30) to wich 1.0 ml of sterile physiological solution was administered also by the intramuscular route. It has been found that the estrous cycle lenght was different (P0,05) between treated and the control groups (40,6 and 23,3%, respectively). In this way, the estrous cycle lenght of the treated cows was extended in regard to the control cows. The hCG administration did not increase pregnant rates

GONADOTROFINA CORIÔNICA HUMANA (hCG) NA INDUÇÃO DE CORPO LÚTEO ACESSÓRIO EM VACAS DA RAÇA CARACÚ

No período de setembro de 2003, 31 vacas da raça Caracu, com idade média de 5 anos, inseminadas artificialmente (AI) no estro base, foram divididas em dois grupos: G1 - grupo tratado (n=16) e G2 - grupo controle (n=15). No 7o dia após a IA, os animais dos G1 e G2 receberam respectivamente 2.500 UI de hormônio coriônico gonadotrófico (HCG) e 1,0 ml de solução fisiológica estéril intramuscularmente. Foram realizados monitoramentos ultra-sonográficos para verificação da localização e diâmetro do corpo lúteo (CL) do cio base e do folículo dominante (FD) da 1ª onda de desenvolvimento folicular no 7o dia após a IA. No 13o dia após a IA, um segundo exame ultrasonográfico foi conduzido para se verificar a existência e o diâmetro do corpo lúteo acessório gerado do FD da primeira onda folicular e do CL. Das 16 vacas tratadas, 15 (93,7%) desenvolveram um CL acessório e destas, quatro (26,6%) demonstraram dois CL acessórios. Dos animais controles nenhum desenvolveu CL acessório. O diâmetro do CL proveniente do cio base mediu no 7o dia 20,6 ± 4,3 e 20,3 ± 3,1 mm nos grupos 1 e 2 respectivamente, e 21,1 ± 2,8 e 20,1 ± 3,1 mm no 13o dia após a IA, não diferindo estatisticamente entre os grupos (P>0,05). O diâmetro do folículo dominante no 7o dia pós IA nos G1 e G2 foram respectivamente 13,1 ± 2,7 e 13,2 ± 2,9 mm. Ao se comparar o diâmetro do FD entre os grupos G1 e G2, no 13o dia pós IA (respectivamente 13,7 ± 2,9 e 11,5 ± 1,7 mm) ocorreu diferença (

HORMÔNIO CORIÔNICO GONADOTRÓFICO (hCG) NA INDUÇÃO DO CORPO LÚTEOACESSÓRIO E SUA RELAÇÃO COM A CONCENTRAÇÃO DE PROGESTERONA PLASMÁTICA EM BOVINOS DE CORTE

No experimento foram utilizados 62 animais da raça Charolesa e Caracú, e inseminados artificialmente (IA). No 7o dia após a IA, as vacas foram divididas aleatoriamente em 2 grupos: tratado (n=32), que recebeu 2.500 UI de hormônio coriônico gonadotrófico (IM) e controle (n=30), que recebeu 1 ml de solução fisiológica estéril, (IM). Verificou-se ultrassonograficamente a localização e o diâmetro: do corpo lúteo do cio base (CLCB) no 7o e 13o dia após a IA, do folículo dominante (FD) da primeira onda no 7o dia, do corpo lúteo acessório (CLA), e do FD da segunda onda folicular. Coletaram-se amostras sanguíneas no 7o, 13o e 24o dia após a IA para a determinação da concentração de progesterona plasmática (P4) pelo método da quimioluminescência. Foram obtidos os resultados: Trinta e um animais (96,87%) desenvolveram um CLA após a aplicação do hCG. O diâmetro do CLCB e do FD no dia 7 e 13 após a IA, não diferiram entre os grupos (P>0,05). A concentração de P4 no dia 7 não diferiu (P>0,05) entre os grupos, porém no dia 13 (

Performance And Economic Analysis Of Finished Lambs In Feedlot

This study aimed to evaluate animal performance and economic performance of feedlot crossbred lambs (Santa Inês+ - Suffolk) fed different diets based on hay from Cynodon dactylon genotypes, through the use of financial measures considering only the period of feedlot, without relating it to the complete management cycle. A total of 30 intact crossbred Suffolk lambs, identified with earrings, with an average age of 90 days and an average body weight of 21.5 kg were used in this study. Diets were formulated using as treatments a standard concentrate and hay of the Cynodon dactylon genotypes Jiggs, Vaquero, Tifton 68, Coast-Cross, Tifton 85 and Russell in a 60:40 forage-to-concentrate ratio. The treatments were distributed in a randomized complete block design with five replicates. There were significant differences between diets in terms of total expenditure on food, and the highest values were obtained for the Jiggs genotype (BRL 48.96/animal). The animals fed diets based on Tifton 68 hay had a higher rate of return (2.16%) and profitability (34.63%) compared to the other diets. The use of diets based on Tifton 68 hay for feedlot lambs in the finishing phase brings higher economic returns compared to the remaining diets.37129330

Reproductive performance of sows inseminated with semen doses stored for up to seven days in long-term extender in a field condition

This study aimed to evaluate the reproductive performance of sows inseminated with semen doses preserved at 15-18 degrees C for up to seven days in long-term extender (Duragen (R)). Parity one (PO1) to PO7 sows were randomly assigned to the following groups: AI1-3 (n=190), insemination with semen doses stored between one and three days; and AI5-7 (n=124), insemination with semen doses stored between five and seven days. Sows were submitted to estrus detection twice a day. Post-cervical insemination according to weaning-to-estrus interval was performed. The farrowing rate (FR) did not differ between the groups (AI1-3=83.2%; AI5-7=82.2%; p>0.05) nor did the total number of piglets born (TPB; AI1-3=14.2 +/- 0.3; AI5-7=14.5 +/- 0.3; p>0.05). Considering the semen dose most likely responsible for fertilization according to its storage time (1, 2-3, 5, and 6-7 days), the FR (72.7%, 87.8%, 85.7%, and 79%, respectively) and TPB (14.4, 14.0, 14.9, and 13.5, respectively) were similar among the groups (p>0.05). In conclusion, the use of semen doses extended with long-term extender stored for up to seven days did not impair the reproductive performance of sows. Therefore, it''s using could optimize production efficiency and logistics of semen dose deliveries to sow farms

Genetic Diversity Of Pacu And Piapara Broodstocks In Restocking Programs In The Rivers Paraná And Paranapanema (brazil)

The genetic diversity of Piaractus mesopotamicus (pacu) and Leporinus elongatus (piapara) broodstocks used in restocking programs in the rivers Paraná and Paranapanema is analyzed. One hundred and twenty specimens (two broodstocks of each species) from fish ponds in Palotina PR Brazil and in Salto Grande SP Brazil were assessed. Ten primers produced 96 fragments, comprising 68 (70.83%) and 94 (97.92%) polymorphic fragments for P. mesopotamicus and L. elongatus broodstocks, respectively. Differences (p <0.05) in the frequency of 15 and 27 fragments were detected for each species, without exclusive fragments. Shannon Index (0.347-0.572) and the percentage of polymorphic fragments (57.3%-94.8%) revealed high intra-population genetic variability for all broodstocks. Results of molecular variance analyses (AMOVA) showed that most variations do not lie between the broodstocks but within each broodstock (89%). Genetic (0.088 and 0.142) and identity (0.916 and 0.868) distance rates demonstrated similarity between the broodstocks of each species, corroborated by Fst (0.1023 and 010.27) and Nm (4.18 and 4.33) rates, with a slight genetic difference due to genic flux. High intrapopulation genetic variability and similarity between the broodstocks of each species was also detected, proving a common ancestry.3742365237