ABSTRACT The aim of the study was to evaluate the inclusion of carotenoids in the diet of layers on the production performance, quality and oxidative stability of eggs during storage. A total of 240 Dekalb White laying hens, 76 weeks of age, were used. The hens were allocated in completely randomized design with eight diets (control diet (CD); astaxanthin (AXT), 10 mg kg⁻1; lutein (LUT), 10 mg kg⁻1; lycopene (LYC), 10 mg kg⁻1; AXT + LUT, 10 mg kg⁻1 each; […]

ABSTRACT The study was carried out with the objective of investigating the enrichment of weaned piglet diets with selenium proteinate (SeP) and sodium selenite (SeS) at two inclusion levels. A total of 40 piglets, averaging 6.60 ± 1.06 kg, were assigned to five dietary treatments: a control diet, and diets supplemented with selenium proteinate (0.15 or 0.30 mg/kg) or sodium selenite (0.15 or 0.30 mg/kg). The SeP-0.30 diet reduced average daily feed intake (ADFI) (P

ABSTRACT This study evaluated the effects of supplementing drinking water with an acidifier blend on growth performance, serum biochemical profile, and gastrointestinal microbial counts of broilers. A mixture containing phosphoric, citric, and tartaric acids was supplied at 0, 60, or 150 mL/1000 L of drinking water during specific production phases. A total of 320 Cobb male broilers were allocated in a completely randomized design with eight replicates of 12 birds each. The acidifier progressively reduced drinking water pH values (5.54, […]

ABSTRACT This study aimed to evaluate the potential of using images taken with a smartphone or scanner as alternatives to conventional spectrophotometry for phosphorus (P) analysis of feedstuff. Twenty-four samples of feed ingredients and commercial concentrates were evaluated. After acid digestion and dilution, the solutions were analyzed using the P-molybdate colorimetric reaction. Standards ranged from 0 to 1.4 mg L−1 at intervals of 0.2 mg L−1 of P in the reading solution. Standards and reading solutions were analyzed in ELISA […]

ABSTRACT The effects of dietary supplementation with enzymatic complexes and plant extracts on weaned piglets were evaluated. Sixty piglets (28 days old) were assigned to six treatments: Control diet (CD); CD with 125 g/ton of Yucca schidigera extract (CDY); CD with 200 g/ton of enzymatic complex (CDE); CD with 400 g/ton of multi-enzymatic complex with emulsifier (CDME); CDE + 125 g/ton YSE (CDE+Y1) and CDE + 250 g/ton YSE (CDE+Y2). Piglets on the CDE+Y1 diet had better feed conversion ratio […]

ABSTRACT The objective of this study was to evaluate the inclusion of high-protein dried distillers’ grains (HP-DDG) in broilers’ diets. A total of 1,200 one-day-old male chicks were weighed and distributed among six treatments, with ten replicates of 20 birds each. The experimental period was divided into three phases: starter (1–21 days), grower (21–33 days), and finisher (33–43 days). The treatments consisted of six dietary levels of HP-DDG in the starter, grower, and finisher phases as follows: T1: 0%; T2: […]

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 […]