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Revista Brasileira de Zootecnia
Scopus
ISSN 1516-3598 · Sociedade Brasileira de Zootecnia · 5.431 artikel di indeks
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Fermentative profile and nutritional composition of tropical grass silages from Brazilian beef farms
ABSTRACT This survey was conducted to assess the fermentation profile and nutritional composition of tropical grass silages on beef farms. Grass silage samples were collected from 51 beef cattle operations located in four Brazilian states (MT, MS, SP, and PR). Additionally, a questionnaire about…
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Developmental factors and genetic groups evaluated by computational modelling for pregnancy prediction when mating at 14 months of age
ABSTRACT The aim of this study was to predict pregnancy in beef heifers, identifying the most impactful variables using computational modelling. Developmental data of 98 heifers up to 480 days (16 months) of age (Charolais, Nellore, and their crossbreeds) were used. At the beginning and end of the…
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Structural characteristics and forage biomass accumulation of dwarf elephant grass genotypes at two stubble heights
ABSTRACT The objective was to evaluate the structural traits and forage accumulation of elephant grass genotypes under two stubble heights. The experiment was conducted in a factorial scheme, with five genotypes (P 2022 S1, 1810, 2111, 2035 and BRS Kurumi) and two stubble heights (25 and 45 cm), in…
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Financial analysis of a dairy farm in the state of Rio Grande do Sul in 2022
ABSTRACT The objective of this study was to perform a financial analysis of a dairy farm located in the southern region of Rio Grande do Sul, comprising 500 hectares and a herd of 380 lactating Holstein cows, with an average daily milk production of 12,000 liters, during the year 2022. Based on the…
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Genetic diversity of the tilapia (Oreochromis spp.) in the Aguamilpa Reservoir, Nayarit, Mexico
ABSTRACT Tilapia is one of the most cultivated species in Mexico and an important fishery resource in the Aguamilpa Reservoir, contributing to the local food supply and economy. However, little is known about its genetic diversity and population structure in this reservoir. This study analyzed the…
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Exploring vitamin A supplementation in beef cattle: Implications for cow-calf systems
ABSTRACT Vitamin A is listed in the fat-soluble vitamins group, whose absorption, transport, and storage are similar to the lipids. However, the vitamin A functions go beyond those reported in the ocular cells’ metabolism being also described in reproductive functions, growth, and specific tissue…
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Toward precision phosphorus nutrition in broilers: insights from a meta-analytical model assessment
ABSTRACT This study used a systematic review and meta-analysis to evaluate a model for estimating the available phosphorus (aP) requirements of broilers. Databases (PubMed, Scopus, and Web of Science) were searched using the PICo methodology, including 90 studies from 1997–2023. The variables…
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The effect of male age, extender, cooling time and freezing method on post-thaw Brahman cattle sperm motility
ABSTRACT The objective of this study was to evaluate how male age, semen extender, cooling (equilibration) time and freezing method influence the quality of Brahman bulls’ sperm after cryopreservation, as measured by Computer-Assisted Sperm Analysis (CASA) parameters. Six Brahman bulls, with an…
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Black wattle (Acacia mearnsii) tannins in broiler diets: intestinal health, bone quality, nutrient digestibility and performance
ABSTRACT This study evaluated increasing dietary levels of Black wattle bark extract (BWE) on broiler performance, nutrient digestibility, intestinal histopathological score, and bone quality. A total of 240 male Cobb 500 broilers, eight days old, were distributed into five dietary treatments (0…
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Essential oil compounds as strategic additives for rehydrated corn grain silage
ABSTRACT This study aimed to evaluate commercially purified essential oil compounds to assess molecule-specific effects when applied as additives to rehydrated corn grain silage (RCGS). Dry ground corn grains were rehydrated to 350 g/kg moisture and packed (>1,000 kg/m3) in 5-L plastic buckets…
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Impact of dietary protease on energy, nutrient availability, and performance of broilers fed diets containing black soldier fly larvae meal
ABSTRACT The experiment aimed to assess the impact of exogenous protease in diets formulated with soybean meal (SBM) or black soldier fly larvae meal (BSFLM) on nutrient retention and broiler performance. Forty-eight female Ross 308 chicks were assigned to a randomized block design study using a 2…
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Comparative analysis of egg enrichment and oxidative stability using selenium, seleno-methionine, and chitosan-encapsulated seleno-methionine
ABSTRACT This study investigated the diet of laying hens containing selenium in organic, inorganic, and Se-Met complex encapsulated with chitosan was investigated in order to enrich eggs and their oxidative stability. The microencapsulation process was performed using two molecular weights of…
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Mixed factor analysis of the influences of beef cattle production characteristics on carcass traits
ABSTRACT This study aimed to investigate whether the beef cattle production system enhances the commercial value of beef carcasses. We assessed which characteristics of the production system most significantly influence the carcass grade and consequently the value generated, using a database from a…
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FiT: A software for adjusting the growth curve of animals
ABSTRACT This paper aims to describe and evaluate FiT, a software that streamlines the process of analysing animal growth curves. It is characterized as a web-based software, developed using the Python and R languages, that adjusts the parameters of the classical nonlinear models Brody, Von…
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Sex and environment-biased maternal investment in cattle
ABSTRACT Mothers must allocate limited resources between raising their offspring and maintaining their own biological functions. In both wild and livestock populations, food availability fluctuates with climate, soil fertility, and rainfall, challenging mothers and calves when environmental quality…
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Effect of lysine restriction on compensatory growth, body composition and nitrogen balance of immunocastrated pigs
ABSTRACT This study aimed to evaluate the effects of lysine (Lys) restriction on compensatory growth, body composition, and nitrogen balance of growing-finishing pigs before and after immunocastration. Sixty-four entire male pigs (39.2 ± 6.8 kg) were randomly assigned one of four treatments…
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Impact of using Angus in Charolais × Nellore rotational crossbreeding on calf performance
ABSTRACT This study aimed to evaluate the effects of incorporating the Angus breed into a rotational crossbreeding system involving the Charolais and Nellore breeds. The experiment included 67 calves born in 2021, which were allocated to four treatments according to their genetic composition…
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Effects of commercial inoculants on tropical corn silage, rehydrated grain, and snaplage
ABSTRACT Three experiments were carried out to evaluate the effects of the following commercial inoculants: Lactiplantibacillus plantarum, Lacticaseibacillus rhamnosus, and L. buchneri (LP+LB) at 2.5 × 105 CFU g−1; as well as L. rhamnosus, L. buchneri, and L. diolivorans (LB+LD) at 2.5 × 105 CFU…
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Influence of bagging machine and roll type combinations on the conservation, processing, and starch degradability of rehydrated corn and sorghum grains
ABSTRACT Five bagger configurations were evaluated for their effects on physical characteristics, fermentation, and starch degradability in corn (Exp. 1) and sorghum (Exp. 2) grain silages. Both experiments were conducted using five treatments, involving baggers with different nominal power ratings…
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Timing of corn grain feeding during fattening: effects on animal performance, carcass characteristics, and meat quality
ABSTRACT The study evaluates the impact of feeding the same amount of corn grain at different times on animal production, carcass characteristics, and meat quality. At weaning, 60 steers (176 kg) were divided into six groups assigned to one of two dietary treatments (n = 3). In dietary treatment…
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