Centro de Ciências Agrárias
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Item Effect of supplementation strategies for ewes during gestation(Brazilian Journal of Animal Science, 2024-10-18) Silva, Neyton Carlos da; Cabral Filho, Sergio Lucio Salomon; Ferreira, Marília Saraiva; Silva, Cássio José da; Fonseca, Angela Aparecida da; Geraseev, Luciana Castro; Silva, Bianca Damiani Marques; Ribeiro, Marinaldo DivinoThis study aimed to evaluate the productive and reproductive performance and the nutritional metabolic condition of ewes supplemented at different stages of gestation in a synchronized reproduction system. Fourty Santa Inês × Dorper crossbreed ewes, pregnant with an average age of ten months and two previous births, were distributed in a completely randomized design, with four treatments: mineral salt, supplementation started 20 days before the estrus synchronization (ES) protocol, supplementation from confirmation of pregnancy (60 days after ES), and supplementation in the final third of gestation (90 days after ES). The adoption of supplementation strategies during the beginning, middle, or end of pregnancy changed the intake and digestibility of dry matter (g/day), with a reduction of 10.53 and 9.14%, respectively, for the mineral salt treatment, in addition to organic matter, crude protein, neutral detergent fiber, acid detergent fiber, non-fibrous carbohydrates, ether extract, and total digestible nutrients, as well as protein, energy, and mineral profiles. There was no difference in the number of ovulations and reproductive and productive performance using supplementation alternatives. Supplementation strategies during the gestation stages influence the intake and digestibility of nutrients, as well as the animal metabolic profiles. However, it does not change reproductive and productive performance.Item Effects of yeast on inflammatory responses in yellow-feathered broilers induced by single and multiple lipopolysaccharide stimulation(Brazilian Journal of Animal Science, 2024-11-25) Zhang, Lijiao; Sun, Huixin; Tao, Hainan; Ding, Yinan; Xue, Siming; Fang, YanThis study investigated the effect of yeast on the growth performance and inflammation of yellow-feathered broilers challenged with lipopolysaccharide (LPS). Four hundred and eighty-one-day-old broilers (BW 38.5±1.01 g) were randomly divided into six treatments with eight replicates of 10 birds each and fed a basal diet with or without 0.025% antibiotics and 0.05 and 0.5% yeast (Saccharomyces cerevisiae, 1.0 × 1010 cfu/g), respectively. Broilers from each replication were intra-abdominally injected with LPS (1.0 mg/kg body weight) or saline at 21, 23, 25, and 27 d of age. Samples were obtained after 3 or 12 h of the first injection (d 21) and the last injection (d 27), respectively. The results showed that LPS stimulation resulted in a significant decrease in productive performance (P<0.01) and a significant decrease in splenic index (P<0.05). Lipopolysaccharide injection caused significant (P<0.01) increase in serum α-AGP in the first hour and haptoglobin in the last 3 h (P<0.01), while other acute phase proteins were not significantly affected. All chickens fed diets supplemented with 0.5% yeast had elevated serum levels of IgA (P = 0.094) and lysozyme (P = 0.067) at 12 h of the first injection compared with those fed antibiotic diets. Lipopolysaccharide injection substantially increased the levels of cytokines in serum. A trend toward decreased levels of IL-10 (P = 0.078), transforming growth factor-beta 1 (P = 0.075), and interferongamma (P = 0.061) was observed in the LPS-stimulation × diet interaction. There was an LPS-stimulated × diet interaction (P<0.05) for interleukin-1beta transcript levels in the liver 12 h after repeated LPS injections. Chickens fed diets with 0.05 or 0.5% yeast tended to have higher levels of toll-like receptor 4 (P = 0.074) transcripts in the spleen at 3 h and β-defensin 1 (P = 0.065) transcripts at 12 h compared with those fed diets with antibiotics. The addition of 0.05 or 0.5% yeast alleviated the adverse effects caused by LPS injection, and this study provided a reference for the application of yeast in the broiler industry.Item Effects of liquid delactosed permeate in nursery piglet diets: improvements in feed conversion with increased post-weaning diarrhea occurrence(Brazilian Journal of Animal Science, 2024-11-25) Vilela, Hellen Lazarino Oliveira; Martinelli, Gabriela Luiza; Silva, Bruna Vianna Garcia da; Trenkel, Andressa Luana Gorzelanski; Toledo, Damares de Castro Fidelis; Careli, Pedro Silva; Carvalho, Silvana Teixeira; Carvalho, Paulo Levi de Oliveira; Santos, Luan Sousa dos; Costa, Leandro Santos; Rocha, Gabriel Cipriano; Genova, Jansller LuizThe objective of this study was to assess the effects of liquid delactosed permeate (DLP) alone or mixed as baby feed with a conventional lactose-containing diet for nursery piglets on growth performance, diarrhea occurrence (DO), blood profile, gastrointestinal tract traits, and bacterial population counts. Ninety male hybrid piglets (7.59±0.63 kg) weaned at 25 days old (day 0) were assigned for 35 days in a complete block design based on body weight (BW) to one of three treatments: control diet (CD) containing lactose via whey permeate powder, supplied in mash and dry form, without DLP; supplemented diet (SD): CD + DLP provided in specific feeders and separated from the mash diet; moist diet (MD): CD moistened with DLP in a 1:1 ratio, 10 replicates, and three piglets per pen. Nursery phases were defined as pre-starter I and II (days 0 to 7, and 8 to 21) and starter (day 22 to 35). Piglets fed MD diet had better feed conversion (FCR) compared with those fed CD in the pre-starter I and II and total period. Piglets in pre-starter I fed MD diet had a higher DO compared with those fed CD, whereas piglets fed SD had intermediate results. Piglets in pre-starter II fed SD had a higher total protein concentration than those fed MD, and CD provided intermediate results. Piglets on MD had higher leukocyte concentrations compared with those fed CD, but piglets fed SD had intermediate results. Piglets fed CD or SD diets had higher colonic content pH than those fed MD. Piglets fed SD or MD diets had longer large intestine lengths than animals fed CD. Delactosed permeate improves FCR in piglets in the pre-starter phases and promotes minor changes in other variables; however, a greater DO is observed in the first few days post-weaning.Item Impact of mixed forage silage with BRS capiaçu grass, ground corn, and varying forage palm levels on aerobic stability, fermentation profile, chemical composition, and digestibility(Brazilian Journal of Animal Science, 2024-11-25) Monção, Flávio Pinto; Rocha Júnior, Vicente Ribeiro; Leal, Dijair Barbosa; Rigueira, João Paulo Sampaio; Caldeira, Luciana Albuquerque; Silva, Ranney Késia Oliveira de Jesus; Antunes, Anselmo Batista; Carvalho, Cinara da Cunha Siqueira; Santos, Alexandre Soares dos; D’Angelo, Marcos Flávio Silveira VasconcelosThis study aimed to evaluate different proportions of cactus pear in silage with BRS Capiaçu grass, along with a 10% inclusion of ground corn grain, focusing on aerobic stability, fermentative profile, chemical composition, and digestibility. The treatments included cactus pear (Opuntia spp.) at increasing levels of 0, 15, 30, 45, and 60% of the natural matter in the silage with BRS Capiaçu grass, plus 10% ground corn grain. Additionally, a control silage composed of BRS Capiaçu grass without ground corn was used. A completely randomized design was employed with six treatments and eight replications. The BRS Capiaçu grass was harvested after 100 days of regrowth. For ensiling, experimental PVC silos of known weights and of 50 cm long and 10 cm in diameter were used. The breakdown of aerobic stability of the silage without cactus pear (BRS Capiaçu grass with 10% ground corn) occurred 144 h after opening the silo. The inclusion of cactus pear in the silage with BRS Capiaçu grass and 10% ground corn grain resulted in a linear increase in pH value. Among the silages with cactus pear inclusion, there was no significant difference in gas losses (P = 0.46) and dry matter (DM) recovery (P = 0.43). There was no significant difference between the silages in terms of acetic acid content (P = 0.91). The content of DM and total digestible nutrients was lower in the control silage compared with the other silages. For each percentage unit of cactus pear inclusion, there was a reduction of 0.1195% in DM content. Additionally, for every 1% inclusion of cactus pear in silage with BRS Capiaçu grass, there was an increase of 0.2007 percentage units in DM digestibility. The optimal proportion of cactus pear in silage with BRS Capiaçu grass and 10% ground corn is up to 60% of the natural matter.Item Characterizing differences in the time to onset of puberty and reproductive performance between East Friesian and Corriedale ewe lambs(Brazilian Journal of Animal Science, 2024) Neimaur, Karina; Perdigón, Fernando; Negrín, Florencia; Cal-Pereyra, Luis; Capucho, Maria Cecilia; Minteguiaga, Mauro; Kremer, RobertoThe objective of the study was to characterize differences in the time to onset of puberty and reproductive variables between East Friesian and Corriedale ewe lambs in an extensive pastoral system. The study was carried out for two consecutive years, and 73 pure-breed ewe lambs were evaluated (35 East Friesian and 38 Corriedale). Plasma progesterone was determined weekly between 4.5±0.5 and 7.2±0.5 months old. The time to onset of puberty was assumed when the progesterone levels were ≥0.6 ng/mL for at least three consecutive blood collections. Body weight and body condition score were also determined. The reproductive variables calculated were fertility (ewe lambs’ pregnancy/ewe lambs mated), prolificacy (lambs born/ewe lambs’ pregnancy), and fecundity (lambs born/ewe lambs mated). We found that 97.1% of East Friesian lambs and 44.7% of Corriedale reached puberty during the bloodsampling period, and there was no significant age difference between breeds. Average body weight at puberty was significantly higher for East Friesian than for Corriedale ewe lambs (44.2±0.8 and 40.6±0.9 kg, respectively). Fertility significantly differed between breeds (85.7 vs 34.2% East Friesian and Corriedale, respectively) and was not affected by year. Of the pregnant ewe lambs, 88.4% carried a single lamb. Prolificacy did not differ with the breed, year, or dam parity but was significantly higher for those lambs born as twins. Fecundity was significantly higher for East Friesian than for Corriedale lambs. Breeding Corriedale and East Friesian ewe lambs in their first year results in different reproductive outcomes.Item Evaluation of the growth of Criollo foals using nonlinear models(Brazilian Journal of Animal Science, 2024) Martins, Marjana Colombi; Souza, Juliana Salies; Souza, João Ricardo Malheiros de; Rodrigues, Walvonvitis Baes; Pimentel, Anelise Maria Hammes; Boligon, Arione AugustiThe present study aimed to evaluate the growth of Criollo foals from birth to 800 days of age using Brody, Gompertz, Logistic, and Von Bertalanffy nonlinear models. The data utilized consisted of weight, height, chest circumference, and shin circumference taken from 75 foals kept in southern Brazil. Morphometric traits analyzed showed mean values ranging from 63 to 325 kg for weight, 0.92 to 1.32 m for height, 0.88 to 1.58 m for chest circumference, and 0.12 to 0.18 m for shin circumference. For the evaluated traits, all applied nonlinear models achieved convergence. The results indicated that the Brody model provided the best adjustments for weight, height, and chest circumference. Gompertz model was found to be the most suitable for describing the growth curve of shin circumference. The animals exhibited an increase in weight during the evaluated period. Height showed the most rapid increase until approximately 365 days of age, followed by a decrease, and a more homogeneous growth pattern thereafter. Chest circumference exhibited more uniform growth in animals from 365 days of age onwards, with slower growth and greater variability observed from 400 days of age. Shin circumference showed greater growth in the first months of age, remaining stable thereafter. We observed that 94 and 5% of the animals in the studied population did not meet the minimum values for height and chest circumference, respectively, according to the breed standards from 24 months of age. Our results can assist in selection and future studies with the Criollo breed.Item Metabolizable energy levels and L-arginine supplementation in diets for broilers under heat stress from 29 to 42 days of age(Brazilian Journal of Animal Science, 2024-10-30) Oliveira, David Henrique de; Cruz, Fábio Loures; Sobrane Filho, Sérgio Turra; Alves, Breno Resende; Abreu, Márvio Lobão Teixeira de; Naves, Luciana de Paula; Rodrigues, Paulo BorgesThe objective of this study was to evaluate the L-arginine supplemental effects for broilers in the final rearing phase (29 and 42 days), during which they were exposed to heat stress and fed diets with different metabolizable energy levels. Performance, carcass parameters, and physiological and biochemical parameters related to lipid metabolism were evaluated. A completely randomized design was used, in a 3 × 2 factorial arrangement, corresponding to three metabolizable energy levels (3000, 3150, and 3300 kcal/kg) in diets supplemented or not with L-arginine (0.66%). Eight replicates composed by eight broilers each (experimental units; boxes) per treatment were evaluated, totaling 48 experimental units. Performance was evaluated in the period from 29 to 42 days old, and carcass and blood parameters were measured at 42 days old. L-arginine supplementation improved feed conversion and blood profile, mainly due to the reduction of total and LDL-cholesterol levels. Broilers that received 3300 kcal/kg of metabolizable energy showed the greatest weight gain, regardless of supplementation or not with arginine. The dietary supplementation with 0.66% of L-arginine for heat-stressed broilers can be recommended, regardless of the feed energy level.Item Mycotoxin concentration in salt-treated wet brewers’ grains and effects of their substitution for soybean meal and corn silage(Brazilian Journal of Animal Science, 2024) Silva, Anderson Moura da; Hentz, Fernanda; Dornelles, Renata da Rosa; Martini, Maria Isabel; Silva, Larissa Henrique da; Ribeiro-Filho, Henrique Mendonça NunesThis study investigated the occurrence of mycotoxins in wet brewers’ grains (WBG) treated with salt (sodium chloride) and the intake, nutrient digestibility, and nitrogen use efficiency in lamb diets. Two experiments were conducted: first, WBG was distributed in plastic boxes and treated with no additive (control), sodium formate (3 g/kg of WBG), or three levels of salt—25, 30, and 35 g/kg of WBG. The WBG were stored at room temperature (17.7±4.6 ℃) for 27 days. In the second experiment, eight six-month-old male lambs were allotted to one of four total mixed ration (TMR) diets in a 4 × 4 double Latin square: 0, 10, 20, and 30% of WBG replacing corn silage and soybean meal. In the first experiment, the concentration of mycotoxins throughout the experiment was lower than the tolerance levels accepted by the European Community and Food and Drug Administration for animal feedstuffs. However, the control and sodium formate groups showed visual fungal development on the WBG surface from the sixth day and presented an unpleasant smell from day 12. In the salt treatments, fungal growth was observed on top of the WBG from day 12 and an unpleasant smell from day 15. Salt-treated WBG showed a lower pH than the control and sodium formate groups and decreased dry matter deterioration. In the second experiment, including up to 30% WBG in the TMR did not affect dry matter, organic matter, neutral detergent fiber, and acid detergent fiber intake or digestibility in lambs. However, the N digestibility and N use efficiency increased with WBG inclusion. These results suggest that salt can be used to increase the storage time of WBG up to 15 days and the inclusion of up to 30% WBG in TMR for lambs can improve N use efficiency without negatively affecting nutrient intake and digestibility.Item Effect of corn grain or lupin bean supplementation on performance of growing steers grazing endophyteinfected fescue and on subsequent finishing period(Brazilian Journal of Animal Science, 2024-10) Canozzi, Maria Eugênia Andrighetto; Zarza, Rodrigo; Banchero, Georgget Elizabeth; La Manna, Alejandro; Fernández, Enrique; Clariget, Juan ManuelOur objective was to compare performance and carcass characteristics of backgrounding steers grazing poor quality pasture, receiving energy or protein supplements during summer, and on subsequent finishing period. Sixty Hereford steers (14 months; 348±33 kg body weight [BW]) were blocked by BW and randomly assigned to one of three treatments (n = 20 per treatment): control (non-supplemented) and supplemented at 0.8% BW with whole grain of corn (CS) or lupin bean (LS) (phase I; 77 days). Over the following 84 days, none of the steers had access to supplement (phase II). During phases I and II, steers grazed together endophyte-infected tall fescue. In the last phase (phase III; 176 days), and until slaughter, steers grazed lucerne and orchard grass and were supplemented at 0.8% BW with high-moisture sorghum grain. Data were evaluated as a complete block randomized design with three treatments. Intake of supplement in CS and LS groups was 1.9 and 2.4 kg DM/d, respectively. Steers supplemented with lupin showed an improvement in the supplement conversion efficiency (5.7:1 vs. 10.0:1). At the end of phase I, BW and average daily gain were different between groups (LS > CS > control). Final body weight in phase II was greater in supplemented steers than in control steers. At slaughter, supplemented groups had greater hot carcass weight than the control group. The advantage obtained by supplementing steers with lupin, compared with corn, was lost in the subsequent phases, as reflected by the absence of differences in carcass weight. Our data illustrate that in similar scenario, energy supplementation is adequate and there is not any extra benefit of adding protein by the use of lupins when considering cattle management and economic factors.Item Influence of THI index, age of bulls, year, and season on production and quality of native sperm of Holstein-Friesian bulls(Brazilian Journal of Animal Science, 2024-10) Popović, Nikola; Djedović, Radica; Stojić, Petar; Stanojević, Dragan; Jovanović, Rade; Beskorovajni, RadmilaThe objective of this research was to determine the influence of heat stress, using the temperature-humidity index (THI), on the production and quality of native sperm of bulls. The effect of heat stress on the quantity of semen (mL), density of ejaculate (number of spermatozoa, 106 /mL), gross sperm motility (1-5), number of frozen doses, and motility after freezing was analysed in 1,017 sperm samples taken from 32 Holstein-Friesian bulls, in the 2017-2019 period, at the Centre for Reproduction and Embryo Transfer in Serbia. The lowest amount of ejaculate (4.18±1.95 mL) and the lowest density of ejaculate (1,189.19±668.23 × 106 /mL) were recorded under conditions of very strong heat stress on the day of semen collection. The level of heat stress measured on the day of semen collection did not affect sperm gross motility, number of frozen doses, and motility after freezing. The level of heat stress at the beginning of spermatogenesis, measured 60 days before semen collection, did not affect the amount of ejaculate and motility of spermatozoa after freezing, but at very strong stress, the lowest density of ejaculate (1,170.34±680.27 × 106 /mL) and gross motility of spermatozoa were found (2.91±0.96). The lowest number of doses per ejaculate was recorded in conditions of moderate heat stress (396.6±157.71). Bulls older than 36 months had the best results according to all tested parameters of native sperm production and quality. The year in which the bulls produced semen did not affect density of ejaculate and sperm motility. The season of semen collection did not significantly affect the production and quality of native sperm, due to the practice of exploiting only bulls with the best sperm quality during the summer.