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: calves with Charolais predominance (PCH), Nellore predominance (PNE), and F1 Angus-cross calves with Charolais (AACH) or Nellore (AANE) maternal predominance. Calves were monitored from birth to seven months of age, and dams were evaluated from calving to […]

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: Control diet (CON; no restriction) or diets with restriction of Lys level in 14 (Lys-14), 28 (Lys-28) and 42% (Lys-42) of estimated Lys requirements for entire growing pigs (Lys restriction phase, from 0 to 28 d). From 29 […]

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 genetic diversity of tilapia from the Aguamilpa Reservoir using SSR markers. According to morphological criteria, three species of the genus Oreochromis were identified, and 85 alleles were detected at five loci. The observed levels […]

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 analyzed included performance (average daily gain (ADG) and feed efficiency (FE)) and bone traits (tibia P, ash, and shear force), expressed relative to the highest response in each study. The aP levels were compared to the Brazilian Tables […]

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 maintenance through gene regulation. In ruminants, vitamin A supplementation can be done in different ways. Orally with carotenoids which β-carotene is the main representative, and intramuscularly by injectable applications of synthetic vitamin A. In cows, it […]

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 a randomized block design, with three replications, considering the rainy and dry periods. Forage accumulation of the rainy period was higher for genotype 2111 (P

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 collected data, the total revenue (TR), fixed and variable costs and expenses were analyzed monthly and for the entire period. Additionally, operating profit (OP), contribution margin (CM), […]

ABSTRACT This study aimed to evaluate the effect of functional amino acid and mineral supplementation on growth performance, carcass characteristics, meat quality, and fatty acid profile of finishing pigs. One hundred and twenty castrated male pigs with an initial weight of 59.7 ± 2.7 kg were used, distributed into four dietary treatments: control; amino acids, control + 0.5% Arg and 0.5% Leu; minerals, control + 0.1% Cr and 0.05% MgO, and amino acids + minerals. From 127 to 159 days […]

ABSTRACT Laying hens’ gut health and microbiota are directly linked to their productivity, egg quality, and overall welfare. This study evaluated the impact of different fiber sources on the performance Dekalb laying hens (63 to 71 weeks of age) and egg quality at 67 and 71 weeks. At the end of the trial (71 weeks), organ development was assessed, and the cecal microbiota was characterized using 16S rRNA sequencing. Birds were divided into four groups: a diet with elephant grass […]

ABSTRACT Rooster fertility has a considerable impact on reproductive efficiency in broiler breeder management, with semen quality being an important factor in fertilization success. This study evaluated the effects of age and body weight on semen quality measures in Ross 308 broiler breeder males. Twenty-four roosters were allocated into two age groups (25-29 weeks and 30-39 weeks) and three body weight categories (underweight: 3.0-3.5 kg; normal: 4.0-4.5 kg; overweight: 5.0-5.5 kg). The volume, concentration, motility, and viability of sperm samples […]

ABSTRACT This study aimed to analyze the effect of grasslands, meadows, and pastures on the efficiency of dairy farming and cattle farming in Türkiye and European Union countries. The primary data for this study included information on the production of raw milk and cattle meat, nitrogen content in treated manure, dairy cow populations, livestock standard units (LSUs), and the extent of grasslands, meadows, and pastures in both European Union countries and Türkiye. In the study, two distinct models were developed: […]