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The ability to discriminate familiar from unfamiliar conspecifics has been demonstrated in several species of fish. Agonistic interactions are among the most frequent behaviors exhibited by territorial species and could offer useful information for the individual recognition process. In agonistic situations, memory may modulate the behavioral response and affect social dynamics, but few studies have explored the memory retention acquired during aggressive encounters. The present study investigated the memory retention of an agonistic encounter in the dusky damselfish Stegastes fuscus. The experimental procedure was divided into three parts: (1) Familiarization; (2) Recognition test; and (3) Memory test. During the familiarization phase, the fish were visually exposed to the same conspecific for 5 days (10 min per day) and the behavior was recorded. On the following day (conspecific recognition test), half of the animals were paired with the same conspecific and the other half with a different conspecific for 10 min, and the behavior was recorded. The fish were retested 5, 10, and 15 days after the test to evaluate memory retention. In the memory test, they were exposed to the same conspecific as before or to a different conspecific. We found that the damselfish reduced their agonistic displays when the stimulus fish was familiar, but when it was unfamiliar, the animals were more aggressive and only reduced their mnemonic response after 10 days. These results suggest that the recognition ability of damselfish can be affected by time and that it modulates agonistic response.

RESUMO

BACKGROUND: Benign tumors of the salivary glands are a group of lesions with varied histopathological and clinical spectrum. The aim was to determine the incidence and clinicopathological characteristics of benign salivary gland neoplasms diagnosed between 2007 and 2016 in a single center located in northeastern Brazil. MATERIAL AND METHODS: Records regarding sex, age, anatomical location, histopathological subtype and treatment were retrieved, and data were analyzed using the Stata/IC software (version 12.0). RESULTS: There were above 7,100 cases of neoplasms in the head and neck region, of which 403 corresponded to salivary gland neoplasms. Of these, 238 (59%) were benign, being pleomorphic adenoma (PA) the most frequent neoplasm (n=178; 74.8%), followed by Warthin's tumor (WT) (n=23; 9.7%). Overall, most cases occurred in females (n=136; 57.1%) and age ranged from 11 to 83 years. The parotid gland (n=188; 79%) was the most common anatomical site, and all patients were treated by surgical excision. Of the cases diagnosed as PA, malignant transformation to carcinoma ex-pleomorphic adenoma (CAEXPA) occurred in 7 (3.9%) cases. CONCLUSIONS: The present study confirmed the clinical and demographic profile of benign salivary gland neoplasms, which contributes to the continuous knowledge of current data about these lesions.

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Objetivou-se avaliar a suplementação de um complexo enzimático à base de xilanase, β-glucanase e fitase em rações para poedeiras comerciais leves em pico de produção de ovos sobre o desempenho e classificação dos ovos. Foram utilizadas 288 poedeiras, com idade inicial de 25 semanas, da linhagem Hy-Line W36, distribuídas em delineamento inteiramente casualizado em esquema de parcelas subdivididas no tempo, com quatro tratamentos e seis repetições de 12 aves cada em quatro períodos de 21 dias. As rações experimentais foram formuladas à base de milho e farelo de soja: Ração CP - controle positivo (100% energia metabolizável recomendada, sem enzimas), Ração CN - controle negativo, constituído por reduções em 75 kcal de energia metabolizável/kg de MS; 0,12 pontos percentuais (pp) de Ca e de P disponível, Ração CN + 60 g/t de complexo enzimático e Ração CN + 100 g/t de complexo enzimático. O complexo enzimático foi à base de: xilanase = 12.000 u/g; β-glucanase = 2.500 u/g e fitase = 5.000 FTU/g. As variáveis avaliadas foram: produção média de ovos (% ovos/ave/dia), peso médio dos ovos (g), consumo médio de ração (g/ave/dia), conversão alimentar por massa de ovos (g/g) e classificação dos ovos de acordo com o peso. Não houve interação entre os tratamentos e os períodos de avaliação (P>0,05). É possível observar que a produção de ovos foi influenciada pelas reduções nutricionais das rações e a inclusão de 100 g/t do complexo enzimático possibilitou a recuperação na taxa de produção de ovos, igualando às poedeiras do tratamento controle positivo (P<0,01). O consumo de ração foi 1,5% maior (P<0,05) para as aves que receberam 100 g/t de complexo enzimático em comparação as poedeiras alimentadas com ração sem adição de complexo enzimático (CN) (98,66 vs 97,20 g/ave/dia). O peso dos ovos respondeu (P<0,01) as reduções nutricionais das rações, sendo mais leves no tratamento CN, mas com recuperação ao se adicionar 100 g/t de complexo enzimático (58,46 vs 59,29 g).(AU)

The objective of this work was to evaluate the supplementation of an enzymatic complex based on xylanase, β-glucanase and phytase in light commercial egg laying feeds at peak egg production,performance and egg classification. A total of 288 laying hens of the Hy-Line W36 breed were used in a completely randomized design in split plot with four treatments and six replicates of 12 layer each in four periods of 21 days each. The experimental rations were formulated based on corn and soybean meal, consisting of four types of ration: CP ration - positive control (100% recommended metabolizable energy without enzymes), CN ration - negative control, reductions in 75 kcal of metabolizable energy, 0.12 percentual points (pp) of Ca and P available, CN Ration + 60 g/t Enzyme Complex and CN Ration + 100 g/t Enzyme Complex. The enzyme complex was composed by: xylanase = 12,000 u/g; beta-glucanase = 2500 u/g and phytase = 5000 u/g. The variables evaluated were: average egg production (egg%/layerday), mean egg weight (g), mean feed intake (g/layer/day), feed conversion per egg mass, and classification according to weight. There was no interaction between the treatments and the evaluation periods (P> 0.05). It is possible to observe that the egg production was influenced by the nutritional reductions of the rations and the inclusion of 100 g/t of the enzymatic complex made it possible to recover the egg production rate, matching the layers of the positive control treatment (P<0.01). Feed intake was higher (P<0.05) for birds receiving 100 g/t enzyme complex compared to hens fed with ration without addition of enzyme complex (negative control). The weight of the eggs responded (P<0.01) to the nutritional reductions of the rations, being lighter in the negative control treatment, but with recovery when adding 100 g/t enzyme complex.(AU)

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Objetivou-se avaliar a suplementação de um complexo enzimático à base de xilanase, β-glucanase e fitase em rações para poedeiras comerciais leves em pico de produção de ovos sobre o desempenho e classificação dos ovos. Foram utilizadas 288 poedeiras, com idade inicial de 25 semanas, da linhagem Hy-Line W36, distribuídas em delineamento inteiramente casualizado em esquema de parcelas subdivididas no tempo, com quatro tratamentos e seis repetições de 12 aves cada em quatro períodos de 21 dias. As rações experimentais foram formuladas à base de milho e farelo de soja: Ração CP - controle positivo (100% energia metabolizável recomendada, sem enzimas), Ração CN - controle negativo, constituído por reduções em 75 kcal de energia metabolizável/kg de MS; 0,12 pontos percentuais (pp) de Ca e de P disponível, Ração CN + 60 g/t de complexo enzimático e Ração CN + 100 g/t de complexo enzimático. O complexo enzimático foi à base de: xilanase = 12.000 u/g; β-glucanase = 2.500 u/g e fitase = 5.000 FTU/g. As variáveis avaliadas foram: produção média de ovos (% ovos/ave/dia), peso médio dos ovos (g), consumo médio de ração (g/ave/dia), conversão alimentar por massa de ovos (g/g) e classificação dos ovos de acordo com o peso. Não houve interação entre os tratamentos e os períodos de avaliação (P>0,05). É possível observar que a produção de ovos foi influenciada pelas reduções nutricionais das rações e a inclusão de 100 g/t do complexo enzimático possibilitou a recuperação na taxa de produção de ovos, igualando às poedeiras do tratamento controle positivo (P<0,01). O consumo de ração foi 1,5% maior (P<0,05) para as aves que receberam 100 g/t de complexo enzimático em comparação as poedeiras alimentadas com ração sem adição de complexo enzimático (CN) (98,66 vs 97,20 g/ave/dia). O peso dos ovos respondeu (P<0,01) as reduções nutricionais das rações, sendo mais leves no tratamento CN, mas com recuperação ao se adicionar 100 g/t de complexo enzimático (58,46 vs 59,29 g).

The objective of this work was to evaluate the supplementation of an enzymatic complex based on xylanase, β-glucanase and phytase in light commercial egg laying feeds at peak egg production,performance and egg classification. A total of 288 laying hens of the Hy-Line W36 breed were used in a completely randomized design in split plot with four treatments and six replicates of 12 layer each in four periods of 21 days each. The experimental rations were formulated based on corn and soybean meal, consisting of four types of ration: CP ration - positive control (100% recommended metabolizable energy without enzymes), CN ration - negative control, reductions in 75 kcal of metabolizable energy, 0.12 percentual points (pp) of Ca and P available, CN Ration + 60 g/t Enzyme Complex and CN Ration + 100 g/t Enzyme Complex. The enzyme complex was composed by: xylanase = 12,000 u/g; beta-glucanase = 2500 u/g and phytase = 5000 u/g. The variables evaluated were: average egg production (egg%/layerday), mean egg weight (g), mean feed intake (g/layer/day), feed conversion per egg mass, and classification according to weight. There was no interaction between the treatments and the evaluation periods (P> 0.05). It is possible to observe that the egg production was influenced by the nutritional reductions of the rations and the inclusion of 100 g/t of the enzymatic complex made it possible to recover the egg production rate, matching the layers of the positive control treatment (P<0.01). Feed intake was higher (P<0.05) for birds receiving 100 g/t enzyme complex compared to hens fed with ration without addition of enzyme complex (negative control). The weight of the eggs responded (P<0.01) to the nutritional reductions of the rations, being lighter in the negative control treatment, but with recovery when adding 100 g/t enzyme complex.

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An experiment was conducted to compare three nutritional programs, which were developed with tannin-free grain sorghum based diets, evaluating performance, carcass yield and bromatological composition of the pectoral muscle of broilers. A total 1360 chicks mixed (50:50), from one to 42 days old Hubbard Flex Broilers, were housed in a completely randomized design consisting of treatments and 10 replicates each, distributed as follows: three programs with whole sorghum grain based diets (nutritional program with daily adjustment, nutritional program with every three days adjustment and nutritional program with four stages and a program with ground and whole sorghum grain based feed (four stages). The cumulative performance was evaluated at, 21 and 42 days, determining feed intake, weight gain, feed conversion and viability. At 42 days, the yield of eviscerated carcass, breast (full and boneless), thighs/drumsticks and wings and breast composition were evaluated. Nutritional adjustments showed better feed conversion, did not affect the carcass, commercial cuts yield and had a good breast meat quality. It can be concluded that daily feed programs could be performed in poultry industry with the mixture of whole sorghum grains and concentrates directly on farms contributing to better logistics and feed transportation cost.(AU)

Assuntos

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An experiment was conducted to compare three nutritional programs, which were developed with tannin-free grain sorghum based diets, evaluating performance, carcass yield and bromatological composition of the pectoral muscle of broilers. A total 1360 chicks mixed (50:50), from one to 42 days old Hubbard Flex Broilers, were housed in a completely randomized design consisting of treatments and 10 replicates each, distributed as follows: three programs with whole sorghum grain based diets (nutritional program with daily adjustment, nutritional program with every three days adjustment and nutritional program with four stages and a program with ground and whole sorghum grain based feed (four stages). The cumulative performance was evaluated at, 21 and 42 days, determining feed intake, weight gain, feed conversion and viability. At 42 days, the yield of eviscerated carcass, breast (full and boneless), thighs/drumsticks and wings and breast composition were evaluated. Nutritional adjustments showed better feed conversion, did not affect the carcass, commercial cuts yield and had a good breast meat quality. It can be concluded that daily feed programs could be performed in poultry industry with the mixture of whole sorghum grains and concentrates directly on farms contributing to better logistics and feed transportation cost.

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The objective of the study was to evaluate the effect of nutritional plans on the productive and economic performance of Hubbard Flex broiler chickens. A completely randomized experimental design was applied, consisting of five treatments. Treatments consisted of five different nutritional plans: a basal diet containing the nutrient and energy levels recommended by literature and designated reference diet; two diets containing 1.5% and 3% lower levels than the reference diet; and two diets containing 1.5% and 3% higher levels than the reference diet (-3%, -1.5%, reference plan, +1.5% and +3%). Feed intake (FI), body weight (BW), feed conversion rate (FCR), livability (L) and productive efficient index (PEI) were determined when broilers were 42 days old. Broilers were processed, and carcass and parts (breast fillet, leg, and wings) yields were determined. The economic viablility of the nutitional plans was evaluated as a function of feed cost/kg live and carcass weights, economic efficiency index (EEI), and cost index (CI). Feed intake and the feed conversion rate decreased as dietary nutrient and energy levels increased. Feed cost/kg live weight, economic efficiency index, and cost index cost increased as dietary nutrient and energy levels increased. Feed intake, feed conversion ratio, production efficiency index, and breast yield improved with increasing nutritional and energy levels. However, worse economic results were obtained with higher nutritional and energy levels.(AU)

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The objective of the study was to evaluate the effect of nutritional plans on the productive and economic performance of Hubbard Flex broiler chickens. A completely randomized experimental design was applied, consisting of five treatments. Treatments consisted of five different nutritional plans: a basal diet containing the nutrient and energy levels recommended by literature and designated reference diet; two diets containing 1.5% and 3% lower levels than the reference diet; and two diets containing 1.5% and 3% higher levels than the reference diet (-3%, -1.5%, reference plan, +1.5% and +3%). Feed intake (FI), body weight (BW), feed conversion rate (FCR), livability (L) and productive efficient index (PEI) were determined when broilers were 42 days old. Broilers were processed, and carcass and parts (breast fillet, leg, and wings) yields were determined. The economic viablility of the nutitional plans was evaluated as a function of feed cost/kg live and carcass weights, economic efficiency index (EEI), and cost index (CI). Feed intake and the feed conversion rate decreased as dietary nutrient and energy levels increased. Feed cost/kg live weight, economic efficiency index, and cost index cost increased as dietary nutrient and energy levels increased. Feed intake, feed conversion ratio, production efficiency index, and breast yield improved with increasing nutritional and energy levels. However, worse economic results were obtained with higher nutritional and energy levels.

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This study investigated the ability of the dusky damselfish Stegastes fuscus to associate conditioned and unconditioned stimuli (single CS-US) and to find a specific place in a clueless ambiece (spatial learning). After tested for colour preference and showing no specific colour attractively, the fish were trained to associate a colour cue with a stimulus fish (conspecific). Fish were then challenged to locate the exact place where the stimulus fish was presented. Stegastes fuscus spent most time close to the zone where stimulus was presented, even without obvious marks for orientation. The results confirm that S. fuscus show single CS-US learning and suggest the fish ability for spatial orientation. Stegastes fuscus appears to use multiple senses (sight and lateral line) for cues association and recall, and appear to perform relational learning similar to mammals. These data suggest the importance of cognitive skill for reef fishes that may have contributed to their establishment and evolutionary success in such complex environment.

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The objective of the present study was to evaluate the supply of a specific-male diet on rooster body weight, hatchability, and fertility. Two diets were supplied during the egg production period: treatment 1, diet formulated for females and containing, in average, 2,830 kcal ME/kg and 15% CP; and treatment 2, diet specifically formulated for male broiler breeders, containing 2,750 kcal ME/kg and 13.5% CP. In the experiment, 26 flocks, with approximately 7,000 females and 840 males each, belonging to the same broiler breeder commercial strain, were distributed into 26 houses (1200m²) on the same farm, and submitted to the same management practices. Body weight was evaluated in 13 flocks per treatment and for five weeks (45, 50, 55, 60, 65), and hatchability and fertility in four incubation lots per treatment and for the same weeks. Data were evaluated by the analysis of mixed models for repeated measurements, using the PROC MIXED of SAS 9.3 (SAS Institute Inc., Cary, NC, USA), and means were compared by the test of Tukey-Kramer at 5% significance level. The specific-male diet allowed body weight control during all analyzed weeks and promoted high hatchability and egg fertility. The increase in the number of chicks hatched demonstrates the economic viability of feeding a specific diet for male broiler breeders.

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