Influência do manejo alimentar no ganho de peso e no desempenho reprodutivo de novilhas de corte

Menegaz, André Luis; Lobato, José Fernando Piva; Pereira, Antonio Carlos Gonçalves

doi:10.1590/s1516-35982008001000019

Cited by 13 publications

(22 citation statements)

References 11 publications

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“…Menegaz et al (2008) obtained significantly different (P<0.05) average BW of 302.8, 317.8, and 330.7 kg in heifers grazing on natural pasture, natural pasture + supplementation, and improved natural pasture, respectively, at the beginning of the breeding season. Those authors considered these BW were adequate to provide good reproductive results.…”

Section: Discussionmentioning

confidence: 93%

Growth and reproductive performance of 14- to 15-month-old Hereford heifers

et al. 2016

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-Aiming at breeding heifers with 14-15 months of age, 100 Hereford calves were subjected to different feeding systems. Heifers grazed on a natural pasture in early winter, fed or not a supplement (14% crude protein; 72% total digestible nutrients), were transferred to a ryegrass pasture for 73 days, and then returned to a natural pasture for 15 days until the beginning of the breeding season. During the last 15 days on ryegrass pasture and the 15 days of the return to the natural pasture, half of the heifers of the two previous systems were offered the supplement, thereby establishing four feeding treatments. Heifers supplemented during the second period, independently of supplementation during the first grazing period, presented higher average daily gain and greater backfat values than the non-supplemented heifers. The breeding season extended for 75 days. At the start of the breeding season (November 18), heifers supplemented during both periods presented higher body condition score and body weight. The highest percentage of puberty was determined in heifers supplemented in the early winter. Heifers supplemented during both periods presented the highest pregnancy rate. Pregnant heifers presented higher average daily gain when fed the supplement during the second period, as well as higher relative pelvic area, body weight, and body condition score at the start and end of the breeding season. To an expressive pregnancy in 14-to 15-month-old heifers, higher weaning weights and pasture allowance are required to get a better answer to supplements offered.

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Section: Discussionmentioning

confidence: 93%

Growth and reproductive performance of 14- to 15-month-old Hereford heifers

et al. 2016

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“…Menegaz et al (2008) obtained 0.189-kg/day weight gain during the period of June 11 to July 08, but with an initial allowance of 2520-kg DM/ha. During the period from June 11 to Sept 10, average weight gain was 0.261 kg/day, but with an average allowance of 1817 kg DM/ha.…”

Section: Resultsmentioning

confidence: 98%

“…During the period from June 11 to Sept 10, average weight gain was 0.261 kg/day, but with an average allowance of 1817 kg DM/ha. Under the conditions of the study of Menegaz et al (2008) stocking rate, of 0.533 kg and 0.170-kg/day with 0.6 and 0.8 AU/ha, respectively. Menegaz et al (2008), between Aug 10/08 and Sept 10, determined weight gains of 0.435 kg/day with 0.6 AU/ha and 9.36-kg DM/100 kg BW allowance.…”

Section: Resultsmentioning

confidence: 99%

“…Under the conditions of the study of Menegaz et al (2008) stocking rate, of 0.533 kg and 0.170-kg/day with 0.6 and 0.8 AU/ha, respectively. Menegaz et al (2008), between Aug 10/08 and Sept 10, determined weight gains of 0.435 kg/day with 0.6 AU/ha and 9.36-kg DM/100 kg BW allowance. The results found in the literature relative to animal performance in natural pastures during autumn and winter are very contradictory, as influenced by climate (rainfall and temperature) and diversity of the flora of the studied region (Menegaz et al, 2008;Neves et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

“…Menegaz et al (2008), between Aug 10/08 and Sept 10, determined weight gains of 0.435 kg/day with 0.6 AU/ha and 9.36-kg DM/100 kg BW allowance. The results found in the literature relative to animal performance in natural pastures during autumn and winter are very contradictory, as influenced by climate (rainfall and temperature) and diversity of the flora of the studied region (Menegaz et al, 2008;Neves et al, 2009). Menegaz et al (2008) obtained in natural pastures average weight gains of 0.261 kg, but at a lower stocking rate (0.6 AU/ha and 1345-kg DM/ha), which supplied higher pasture allowance as that obtained in the present study.…”

Section: Resultsmentioning

confidence: 99%

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Natural and improved pastures on growth and reproductive performance of Hereford heifers

2012

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-This study evaluated yearling growth and reproductive performance of Hereford heifers at 24-26 months of age grazing on natural pastures at two stocking rates during winter and spring, associated or not to improved natural pastures.Heifers were classified according to three weight groups (Light, Medium and Heavy) and randomly distributed into four feeding management practices: 0.6 AU (1 animal unit = 450-kg body weight) -heifers on natural pastures at a stocking rate of 0.6 AU/ha; 0.8 AU -heifers on natural pastures at a stocking rate of 0.8 AU/ha; 0.6 AUI -heifers on natural pastures at a stocking rate of 0.6 AU/ha and on improved natural pastures between Sept 1 st and Nov 1 st ; 0.8 AUI -heifers on natural pasture at a stocking rate of 0.8 AU/ha and on improved natural pastures between Sept 1 st and Nov 1 st . The stocking rate of 0.8 AU resulted in significant weight loss during winter months (-0.138 and -0.356 kg for 0.6 and 0.8 AU, respectively). Heifers grazing during the spring on improved natural pastures presented higher weight gain before the breeding season and higher body weight and body condition score in the beginning and end of the breeding season in relation to those grazing only on natural pastures. Heifers kept at 0.6 AU/ha obtained 69.7% pregnancy rate, which was significantly higher than the 54.2% of those managed at 0.8 UA/ha.Heifers grazing on improved natural pastures during the spring achieved 83.8% pregnancy rate, whereas those maintained on natural pastures achieved only 40.2%. Light and medium heifers lost less weight during the winter as compared with the heavy ones, but weight differences between groups remained until the end of the breeding season. Heavy heifers have higher pregnancy rates. Heifers submitted to lower stocking rate and those grazing on improved natural pastures conceive earlier.

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Nutritional planning for Nellore heifers post-weaning to conception at 15 months of age: performance and nutritional, metabolic, and reproductive responses

Almeida

Marcondes

Rennó

et al. 2018

Trop Anim Health Prod

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The objective of this study was to evaluate the effects of strategic supplementation in the dry period and dry/rainy transition period on the performance and nutritional, metabolic, and reproductive responses of Nellore heifers grazing Urochloa decumbens. Forty-eight Nellore heifers with age and body weight (BW) of eight months and 235 ± 3.3 kg, respectively, were used. The experimental design was a completely randomized design, with four treatments, all with 12 replications. The evaluated strategies were as follows: low supplementation (LOHI; 0.2% of BW/heifer/day) in the first 90 days and high supplementation (0.6% of BW/heifer/day) in the 90 days thereafter; average supplementation (AVER) with 0.4% of BW/heifer/day for 180 days; high supplementation (HILO; 0.6% of BW/heifer/day) in the first 90 days and low supplementation (0.2% of BW/heifer/day) in the 90 days thereafter; only mineral mix (MM) ad libitum during the 180 days. Data were evaluated using orthogonal contrasts. Supplementation improved the performance of the animals during of dry period (P < 0.05) and dry/rainy transition period (P < 0.05). Supplemented animals had higher longissimus muscle area (LMA) and subcutaneous fat thickness (SFT) at the end of the experiment (P < 0.05). Multiple supplementation increased intake of dry matter (DM), organic matter (OM), and crude protein (CP) in kg/day throughout the experiment. The supplementation increased the digestibility of DM, OM, CP, apNDF, and TDN (P < 0.05). Serum urea nitrogen (SUN), glucose (GLUC), insulin (INS), and progesterone (PROG) were higher in supplemented heifers (P < 0.05). Supplementation reduced the concentrations of non-esterified fatty acids (NEFA) (P < 0.05) and increased conception rate (P < 0.05). In summary, the supplementation strategies adopted in this study improve the performance, metabolic status, and carcass traits of heifers under grazing, allowing an improvement in the conception rate of 15-month-old Nellore heifers.

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Influência do manejo alimentar no ganho de peso e no desempenho reprodutivo de novilhas de corte

Cited by 13 publications

References 11 publications

Growth and reproductive performance of 14- to 15-month-old Hereford heifers

Growth and reproductive performance of 14- to 15-month-old Hereford heifers

Natural and improved pastures on growth and reproductive performance of Hereford heifers

Nutritional planning for Nellore heifers post-weaning to conception at 15 months of age: performance and nutritional, metabolic, and reproductive responses

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