Title

Efecto de la suplementacion proteica y la utilizacion del sistema de espectroscopia de refleccion infra-roja en heces, en vacas lactantes bajo condiciones comerciales en agostadero

Author

MIGUEL ÁNGEL BAUTISTA HERNÁNDEZ

Contributor

RICARDO NICOLAS SILVA CERRON (Thesis Adviser)

HERIBERTO DÍAZ SOLÍS (Thesis Adviser)

LAURA EMILIA PADILLA GONZALEZ (Thesis Adviser)

Access level

Open Access

Summary or description

"Se evaluó el efecto de la suplementación proteica en vacas lactantes en la época de invierno en el agostadero, y se analizaron las heces en condiciones de rancho por medio del sistema de espectroscopia de reflexión infra-roja (NIRS, por sus siglas en ingles). Se utilizaron 24 vacas lactantes, 12 vacas para testigo (Gt) y las otras 12 para el tratamiento (GT), al GT se le proporciono un suplemento con un nivel de proteína del 32 por ciento, en un periodo de 85 días. El procedimiento estadístico fue un análisis de varianza (ANVA) para las variables ganancia de peso (Gp), condición corporal CC, proteína cruda (PC), y materia orgánica digestible (MOD). Además un análisis de factores (AF) utilizando las variables anteriores y se añadió nitrógeno fecal (FN) y fósforo fecal (FP) a este análisis. El consumo de suplemento del GT fue de 455 gr en base seca (1.3 kg en base humeda). Al realizar un ANVA para Gp y utilizar peso inicial como covariable, se encontró una diferencia estadística significativa entre GT y Gt (P< .061), al presentarse una Gp del GT de 5 kg, mientras Gt perdió 13 kg. CC no muestra una diferencia significativa (P> .10). PC no mostró diferencia estadística entre tratamientos para la variable PC. La MOD de los tratamientos muestra una diferencia significativa al (P < 0.005), en promedio la MOD de GT y Gt son 57 y 55.8 por ciento. En el análisis de factores (AF), los primeros tres factores explican el 73.83 por ciento de la varianza total. El F1 explica el 35.71 por ciento de la varianza total y las variables que lo explican son periodo de muestreo (PM), MOD, FN y FP. El F2 contiene el 22.61 por ciento de la varianza total, y explica la relación negativa entre T y CA. El F3 explica el 14.54 por ciento de la varianza total, donde las variables que interactúan son PC y FN"

"Protein supplementation in Mexican rangeland crossbred beef lactating cows during winter under ranch conditions and Near-Infrared reflectance spectroscopy (N1RS) of their fecal samples grazing native forage was performed. Twenty-four crossbred beef cows were used, 12 for control and 12 for treatment. Treatment consisted of a 32 percent protein supplement under restricted consumption and NIRS for fecal monitoring of forage diet quality was utilized in both control and treatment cows for 85 days during winter (January — April). Statistical procedures were done through ANOVA and Multivariate Analysis for parameters body weight gain, body condition score, crude protein and digestible organic matter of forage consumed by the control and treatment groups. Fecal Nitrogen and Fecal Phosphorus ,ecological measures reported by NIRS were only analyzed by factor Analysis. Results show that consumption of the supplement by the treatment group was estimated at 1.3 kg as fed equivalent to .455 kg dry matter. For body weight gain and having initial weight as a co variable, a significant difference was found (p < .061). The control group lost 13 kg while the treatment gained 5 kg during the trial. There was no significant difference (p > .10) in body condition score. Fecal samples monitored through NIRS showed no significant difference for crude protein content between treatment, 5.13 and control 5.21 percent . But for Digestible Organic Matter significant difference (p< .005) was found for the treatment group with 57 percent compared to 55.8 for the control. Factor Analysis explains 73.84 percent of total variance. Factor one composed of sampling date, Digestible Organic Matter, Fecal Nitrogen and Fecal Phosphorus explains 35.71 percent of the total variability. Factor two which includes Treatment and stocking rate explained 22.61 of total variability. Factor three that includes Crude Protein and Fecal Nitrogen explained 15.52 of total variability"

Publish date

2002

Publication type

Master thesis

Publication version

Published Version

Format

application/pdf

Language

Spanish

Audience

Students

Researchers

Source repository

Repositorio Digital CID-UAAAN

Downloads

105

Comments



You need to sign in or sign up to comment.