This study aims to evaluate the production and quality of buffel (Pennisetum ciliare), rhodes (Chloris gayana), and blue grama (Bouteloua gracilis) forage with three defoliation dates —at 50, 80, and 110 days after regrowth (dar)— in Valle del Mezquital. Crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), total digestible nutrients (TDN), relative feed value (RFV), and metabolizable energy (ME) were determined. A completely randomized design with three repetitions, a Tukey test for mean separation (α 0.05), and SAS Proc GLM for data analysis were used. The highest forage production occurs in the rhodes forage at 110 dar (12,936 kg DM ha-1). The highest CP (10.6%) was found in the buffel forage at 50 dar; in the rhodes forage, both values (80 and 110) were lower than 7%. The highest RFV was obtained by exotic grasses; however, higher TDN was recorded for the blue grama grass. Rhodes grass obtained the lowest ME at 80 dar (1.76), while the highest ME was obtained by buffel at 50 dar (1.91). The three varieties can be defoliated when the plants show intermediate yield and nutritional value, i.e., 80 days after the regrowth begins; nevertheless, buffel and rhodes should be defoliated at 50 dar.
Objective: To evaluate two types of concentrate (homemade and commercial), in laying percentage (LP, %), weight (EW, g), and egg mass (EM, g bird-1 d-1), among hens in a cage-free system. Methodology: Sixty hens aged 37 weeks (Rhode Island Red and Barred Plymouth Rock) were assigned two treatments: COM, 150 g of commercial concentrate bird-1 d-1and CAS, 150 g of homemade concentrate bird-1 d-1. The birds were managed in a cage-free system with access to a meadow of white clover (Trifolium repens L.). LP, EW and EM were evaluated for 11 weeks. Results: LP was different between treatments (P<0.05) in the last four weeks of observation. In this time, the COM birds laid 17 to 24% more than CAS birds. The EW produced by birds from the COM group (59.1 to 60.7 g) was greater (P<0.05) than that of the CAS birds (55.0 to 57.0 g). In the second half of the study period, a lower EM (P<0.05) was observed in the CAS treatment (24.7 to 31.8 g bird-1 d-1) compared to the COM treatment (39.7 to. 41.8 bird-1 d-1). Study Implications: The results obtained are only valid for the types of concentrate evaluated and under the specified experimental conditions. Conclusions: The homemade concentrate reduces the productive performance of hens in a cage-free system in terms of LP, EW, and EM, when compared to the commercial concentrate.
Objective: to evaluate the nutritional quality of white worm larvae (Agathymus remingtoni) of the maguey lechuguilla plant (Agave lechuguilla).Design/Methodology/Approach: samples of A. remingtoni larvae were collected from the stems and leaves of wild maguey lechuguilla that grows in the hills of the community of San Francisco, Municipality of Epazoyucan, in the state of Hidalgo, Mexico. Proximate analysis was performed and the calcium and phosphorus contents were determined inlarvae samples.Results: larvae of A. remingtoni had a protein content of 33.69% on a dry basis, and 12.05% on a wet basis. Other results obtained were as follows: ethereal extract 15.97%, dry matter 35.76%, moisture 64.24%, ash 0.82%, crude fiber 0.85%, free nitrogen extract 6.07, calcium 0.40%, and phosphorus 0.56%.Limitations/Implications: During: in the literature review carried out, no reports were found on the nutritional quality of the white worm (Agathymus remingtoni) of maguey lechuguilla (Agave lechuguilla).Findings/Conclusions: Agathymus remingtoni larvae have excellent nutritional content, which makes them an alternative source of protein, fat, calcium, and phosphorus for human consumption and livestock feed.
Objective: To describe the factors that affect the incubation of fertile eggs of Creole hens (Gallus gallus domesticus) at Mezquital Valley, Hidalgo, Mexico. Design/Methodology/Approach: 448 eggs of Creole hens were incubated in a Casser model 7622 incubator, in which the number of infertile and fertile eggs was evaluated; within the number of fertile eggs, the number of dead embryos was determined; due to dehydration or damage caused by fungi and bacteria. From the live hatched chickens, those that died due to omphalitis were recorded. Results: 272 of 448 incubated eggs were fertile; 119 of them hatched and 153 were dead embryos. While 176 were infertile. Among the dead embryos, 84 of dehydration, 69 due to fungal and bacterial infection and 11 live hatched chicks due to omphalitis. Limitations/implications: The literature review found little information on factors affecting the hatching of fertile Creole chicken eggs in backyard flocks. Findings/conclusions: Infection by fungi and bacteria increase embryonic mortality, while omphalitis increases mortality during the first days of life of the backyard Creole chickens. High storage temperature in the nest or incubator causes embryo dehydration.
Por su importancia como cultivo estratégico de invierno parcialmente caracterizado, se estudió la composición química de avena forrajera variedad Chihuahua. En hoja, tallo, maleza, panícula y planta completa, se determinaron (g 100 g-1) fibra detergente neutro (FDN), fibra detergente ácido (FDA), lignina cruda (LC), cenizas (Cen), proteína cruda (PC) y grasa cruda GC), y se evaluaron sus correspondientes rendimientos (kg ha-1). La PC disminuyó (p < 0.05) y los contenidos de FDN, FDA y LC aumentaron (p < 0.05) en hoja, tallo, maleza y planta completa al avanzar la edad de corte. El contenido de GC aumentó con la edad en hoja y panícula (p < 0.05), pero no se observaron cambios en tallo ni en maleza (p > 0.05). En panícula el contenido de FDN disminuyó fuertemente, 21.6% y el de PC disminuyó levemente, 1.0% (p < 0.05), mientras que los de LC y GC aumentaron (p < 0.05) al avanzar la edad. Se detectó un máximo rendimiento de PC en hoja y maleza a los 75 días de edad, mientras que, en tallo el rendimiento máximo de PC se produjo a los 90 días. Para que el forraje de avena, variedad Chihuahua, no contenga tanta fibra y a fin de que los contenidos y rendimientos de proteína no sean tan bajos, se sugiere cosechar esta planta entre 75 y 90 días de edad.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.