Resumen El objetivo del presente estudio fue determinar el comportamiento productivo del nacimiento al destete de terneros simmental y sus cruzas con brahman en un rebano productor de carne en el sur de Tamaulipas, Mexico. Se analizaron los registros de los anos 1994 a 2005, peso al nacimiento (PN, n = 947), peso al destete ajustado a 205 dias (PD205, n = 802), y ganancia diaria predestete (GDP, n = 802), utilizando el metodo de minimos cuadrados para determinar los efectos de grupo racial (GR), ano (AP) y epoca (EP) de parto, numero de parto (NP), sexo de la cria (SX), y las interacciones de primer orden sobre PN; mientras que para GDP y PD205 se considero ademas el PN como covariable. Las medias generales para PN, GDP y PD205 fueron 35.2 ± 6.7, 0.774 ± 0.175 y 194.3 ± 37.3 kg, respectivamente. El GR afecto significativamente (p 0.05) en ninguna de las variables de respuesta. Palabras clave: comportamiento pre-destete, terneros simmental. Summary The objective of this study was to determine the productive performance in body weight change from birth to weaning, of calves simmental and their crosses with brahman in a beef cattle in the south of Tamaulipas, Mexico. Data were analyzed from 1994 to 2005 years (birth weight BW, n = 947; weaning weight adjusted to 205 days WW205, n = 802; and pre-weaning daily gain weight DGW, n = 802) using the method of minimum square to determine the effects of breed group (BG), year (YC), and season (SC) calving, parity number of cow (PC), and sex of calves (SX); and the interaction of first order on the variables of BW, DGW and WW205. In DGW and WW205 were considered the covariable of BW. The averages for BW, DGW and WW205 were 35.2 ± 6.7, 0.774 ± 0.175 and 194.3 ± 37.3 kg, respectively. The BG was affected (p 0.05) on anyone's variables. Key words: pre weaning traits, simmental calves. Resumo O objetivo deste estudo foi determinar a eficiencia produtiva do nascimento de bezerros na desmama Simental e seus cruzamentos com Brahman, em um rebanho produtor de carne de bovino no sul do Tamaulipas, Mexico. Foram analisados os registros dos anos de 1994 a 2005, peso ao nascer (PN, n = 947), desmame peso ajustado para 205 dias (PD205, n = 802), eo ganho diario predestete (PIB n = 802), utilizando o metodo dos minimos quadrados para determinar os efeitos de grupo racial (GR), ano (PA) e tempo (EP) de nascimento, numero de partos (NP), o sexo de criacao (SX) e as interacoes de primeira ordem em PN, enquanto que para o PIB e PD205 tambem e considerado como o PN covariable. e as interacoes de primeira ordem em PN, enquanto que para o PIB e PD205 tambem e considerado como o PN covariable. O CR afetados significativamente (p 0.05) em nenhuma das variaveis resposta. Palavras chave: bezerros simental, comportamento pre-desmame.

/pdf/caracteristicas-pre-destete-de-bovinos-simmental-bos-taurus-2v02ec3pbd.pdf

Características pre-destete de bovinos simmental ( Bos Taurus) y sus cruces con brahman (Bos indicus) en el trópico mexicano

espanolEl objetivo fue evaluar el comportamiento productivo de un hato de ganado Charolais, para lo cual se analizaron los registros productivos de la finca "Ex Hacienda El Carmen", en Guemez, Tamaulipas, Mexico. Los animales fueron alimentados basicamente con pastos, las vacas se reprodujeron todo el ano y las crias se mantuvieron con la vaca hasta el destete. Las variables peso al nacimiento (PN = 647), peso al destete ajustado a 205 dias (PDA205 = 647) y ganancia diaria de peso (GDP = 647) fueron analizadas usando la tecnica de minimos cuadrados para determinar los efectos de ano de nacimiento (AN = 1979, 1980,…1989); epoca de nacimiento (EN = nortes, secas y lluvias), numero de parto de la vaca (NP = 1, 2,…8), sexo de la cria (SC = macho y hembra), incluyendo el peso al nacimiento (PN) como covariable para PDA205 y GDP. Las medias obtenidas para PN, PDA205 y GDP fueron 29,6 ± 3,6, 219,6 ± 34,2 y 0,770 ± 0,134 kg, respectivamente. PN, PDA205 y GDP se vieron afectados (P EnglishThe objective was to assess the productive performance of a Charolais herd, which was based on the analysis of production records of the "Ex Hacienda El Carmen", farm, located in Guemez, Tamaulipas, Mexico. Animals were fed forages on pastures, cows were bred throughout the year and calves kept with the cow until weaning. The variables of birth weight (BW = 647), adjusted weaning weight to 205 days (AWW205 = 647) and average daily gain (ADG = 647) were analyzed using least squares to determine the effects of year of calving (YC = 1979, 1980,...1989); calving season (CS = windy, dry and rainy season), parity of the cow (PC = 1, 2,...8), sex of the calf (SC = male and female), including the birth weight (BW) as a covariate for AWW205 and ADG. Averages obtained for BW, AWW205 and ADG were 29.6 ± 3.6, 219.6 ± 34.2 and 0.770 ± 0.134 kg, respectively. BW, AWW205 and ADG were affected (P

https://dialnet.unirioja.es/descarga/articulo/6055503.pdf

Comportamiento productivo de un hato Charolais bajo condiciones de trópico seco en Tamaulipas, México

Para evaluar el efecto de factores no geneticos y de grupo racial sobre el peso al nacer (PN), se analizaron 5136 datos de becerros nacidos en una zona de bosque seco tropical. Los datos fueron analizados utilizando un modelo lineal aditivo por el metodo de maxima verosimilitud restringida que incluyo los efectos fijos: ano de nacimiento (AN; 2001,..,2007); mes de nacimiento (MN; enero, febrero, octubre, noviembre y diciembre); edad de la madre al parto (EM; 3,..,11 anos o mas), sexo (S; hembra-macho); grupo racial del becerro (GR1: mestizos Bos taurus de las razas Angus, Braunvieh, Carora, Holstein, Simmental, Romosinuano y Senepol; GR2: predominantemente Bos indicus de las razas Brahman, Nelore, Guzerat y Gyr). El AN, MN, EM y S afectaron (P<0,05) el PN. El efecto de GR no fue significativo. Se estudiaron todas las interacciones incluyendo en el modelo definitivo solo las significativas (P<0,05) AN*MN, AN*EM, AN*GR, MN*GR, S*GR. El promedio de PN fue 32,1±0,20 kg (media±error estandar) considerado normal para una adecuada sobrevivencia de la cria y de la madre. Las variables que mas afectaron el PN fueron AN (entre anos extremos se presentaron diferencias de 5,35 kg; 17,8 %), S (los machos abstract

Non Genetic and Breed Group Factors Affecting Birth Weight in a Beef Cattle System Production

To determine the influence of some non-genetic factors on birth (BW) and weaning weight corrected to 205 d (WWA) of Angus calves, 1,999 and 1,574 weights were analyzed. All the animals were grazing and they were vaccinated against enzootic every six months. The data was analyzed using an analysis of variance under least squares methodology and the statistical model included: year of birth (YB = 1991-2007), season of birth (SB = Cold, Dry and Rainy), parity number (PN = 1, 2, 3,… ≥9 calving) and sex (SX = Males and Females) and the interactions YB*SB, YB*PN and YB*SX. All effects and the interactions affected BW and WWA (P<0,01). The means and standard deviation were 36.2 ± 2.6 and 186.8 ± 30.0 kg, respectively. The differences between the best years (2007) and worse year (1991) to BW was 1.1 kg. Cows of 1, 2 and ≥9 calving had calves less heavy. Male calves weighted more than female to birth and weaning. The interactions that involved YB indicate that the direction and magnitude of the effects are not constant within every year. The interaction YB*SB, YB*PN and YB*SX were important on WWA without being possible to define some tendency or magnitude. All the environmental effect studied was important.

/pdf/factores-no-geneticos-que-afectan-el-peso-al-nacer-y-destete-2o3h7qq6qc.pdf

Factores no genéticos que afectan el peso al nacer y destete de terneros Angus

To determine the influence of some non-genetic factors on birth (BW)
and weaning weight corrected to 205 d (WWA) of Angus calves, 1,999 and
1,574 weights were analyzed. All the animals were grazing and they were
vaccinated against enzootic every six months. The data was analyzed
using an analysis of variance under least squares methodology and the
statistical model included: year of birth (YB = 1991-2007), season of
birth (SB = Cold, Dry and Rainy), parity number (PN = 1, 2, 3,…
≤9 calving) and sex (SX = Males and Females) and the interactions
YB x SB, YB x PN and YB x SX. All effects and the interactions affected
BW and WWA (P <0,01). The means and standard deviation were 36.2
± 2.6 and 186.8 ± 30.0 kg, respectively. The differences
between the best years (2007) and worse year (1991) to BW was 1.1 kg.
Cows of 1, 2 and ≤9 calving had calves less heavy. Male calves
weighted more than female to birth and weaning. The interactions that
involved YB indicate that the direction and magnitude of the effects
are not constant within every year. The interaction YB x SB, YB x PN
and YB x SX were important on WWA without being possible to define some
tendency or magnitude. All the environmental effect studied was
important.

/pdf/non-genetic-factors-affecting-birth-and-weaning-weight-in-4ieg2nctvl.pdf

José Francisco Gutiérrez-Michel

Papers

Factores no genéticos que afectan el peso al nacer y destete de terneros Angus

Non-genetic factors affecting birth and weaning weight in Angus calves