Evaluación genética de la facilidad de parto en la raza bovina Parda de Montaña usando los modelos lineal y umbral

Lacruz, X. Cortés; Delgado, Ricardo Revilla; Casasús, I.; Sanz, A.; Achiaga, Javier Ferrer; Banzo, P.; Mata, Daniel Villalba

doi:10.12706/itea.2017.010

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…Despite the fact that weight at calving complied with NRC recommendations, 36% of the primiparous cows needed assistance at calving. This rate was similar to an incidence of assistance of 38% described both for beef [40] and dairy heifers [24], and was not affected by any of the factors analyzed herein.…”

Section: Accepted Manuscriptsupporting

confidence: 85%

Influence of postweaning feeding management of beef heifers on performance and physiological profiles through rearing and first lactation

Rodríguez-Sánchez

Sanz

Ferrer

et al. 2018

Domestic Animal Endocrinology

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The aim of this study was to examine the effects of 2 postweaning feeding management approaches (FEED: 0.8 [HIGH] vs 0.6 [MOD] kg/d target ADG) on the performance of heifers of 2 beef breeds (BREED: Parda de Montaña [PA] vs Pirenaica) calving at 2 yr. Twenty-five heifers previously creep fed before weaning (6 mo) were assigned to 2 planes of nutrition from 6 to 15 mo of age. At 15 mo, they were inseminated, and then received similar diets until weaning of their first calf (4 mo postcalving). Several parameters were measured to analyze growth and development (BW; ADG; size measures at 6 mo, 15 mo, calving, and weaning), performance at puberty and first breeding, and dam and calf performance in the first lactation (calving traits, ADG, milk yield). Metabolic (glucose, cholesterol, NEFA, β-hydroxybutyrate, and urea) and endocrine status (IGF-I and leptin) were assessed in plasma samples collected every 3 mo from 6 mo to calving and monthly during lactation. No interaction between BREED and FEED was observed. Heifers from the HIGH feeding treatment had higher postweaning ADG than those on the LOW diet. At 15 mo, they had greater BW, heart girth, and external pelvic area, but they did not differ thereafter. All heifers reached puberty at similar BW (55% mature BW) but different ages. Heifers from the HIGH treatment tended (P < 0.09) to be pubertal earlier, and PA heifers were 1.6 mo younger than Pirenaica heifers (P < 0.05) at puberty. At the time of conception (452 ± 59 kg) and calving (471 ± 51 kg), BW was above common recommendations in all groups. Calving traits and performance in lactation did not differ between feeding treatments. BREED only influenced birth weight; PA calves being heavier (P < 0.05), which resulted in a larger calf/cow BW ratio, but no effect on calving difficulty or subsequent performance. Metabolic substrates and hormones depended mostly on sampling date, which was related to current energy and protein intake. Glucose (P < 0.001), cholesterol (P < 0.001), and IGF-I (P < 0.05) were greater during the postweaning phase in heifers on the HIGH diet, and persistent physiological effects were observed during lactation. Age at puberty was negatively related with IGF-I (r = -0.43, P < 0.001), but not with leptin concentrations. In conclusion, regardless of breed, a moderate growth rate ensured adequate heifer development and performance until the first lactation, whereas no advantage was gained from enhanced postweaning gains.

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Section: Accepted Manuscriptsupporting

confidence: 85%

Influence of postweaning feeding management of beef heifers on performance and physiological profiles through rearing and first lactation

Rodríguez-Sánchez

Sanz

Ferrer

et al. 2018

Domestic Animal Endocrinology

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“…Esto podría relacionarse en parte con la dificultad del primer parto, que tiende a ser mayor cuanto menor sea la edad de la novilla. Así, novillas que paren más jóvenes podrían tener más dificultades en el parto y como consecuencia ver afectada su producción (Cortés-Lacruz et al, 2017).…”

Section: Discussionunclassified

Efecto de los factores zootécnicos en la producción en primera lactación de vacas Frisonas en N.O. de España

Sánchez¹,

Fouz²,

Respaldiza³

et al. 2018

ITEA

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Existen numerosos factores que afectan a la rentabilidad de la producción lechera; uno de los más importantes es el nivel productivo en primera lactación, que ha sido relacionado con parámetros del rendimiento futuro del animal, como la longevidad. El objetivo de este estudio fue determinar la relación entre la producción normalizada en la primera lactación de novillas de leche y los siguientes parámetros zootécnicos asociados a la novilla (estación de nacimiento, valor genético para la producción de leche, edad al primer parto, problemas al parto, sexo de la cría nacida) y de la madre (número de parto y dificultad del mismo cuando parió a esa novilla y duración de la gestación; producción lechera al secado y duración del periodo seco previos al parto de la novilla). Se obtuvieron datos de 12.029 novillas Frisonas que finalizaron su primera lactación en el año 2015 y se emplearon modelos de regresión para identificar aquellos factores que se relacionaban con la producción normalizada. De los parámetros analizados, aquellos que parecían tener mayor influencia, fueron

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The milk yield of dams and its relation to direct and maternal genetic components of weaning weight in beef cattle

et al. 2017

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Evaluación genética de la facilidad de parto en la raza bovina Parda de Montaña usando los modelos lineal y umbral

Cited by 3 publications

References 19 publications

Influence of postweaning feeding management of beef heifers on performance and physiological profiles through rearing and first lactation

Influence of postweaning feeding management of beef heifers on performance and physiological profiles through rearing and first lactation

Efecto de los factores zootécnicos en la producción en primera lactación de vacas Frisonas en N.O. de España

The milk yield of dams and its relation to direct and maternal genetic components of weaning weight in beef cattle

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