Higher feeding diets effects on age and liveweight gain at puberty in crossbred Nelore × Hereford heifers

Barcellos, Júlio Otávio Jardim; Pereira, Gabriel Ribas; Dias, Eduardo; McManus, Concepta; Canellas, Leonardo Canali; Bernardi, Mari Lourdes; Tarouco, Adriana Kroef; Prates, Ênio Rosa

doi:10.1007/s11250-014-0593-6

Cited by 20 publications

(14 citation statements)

References 30 publications

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“…Recently, we have demonstrated an increase in follicular diameter in heifers fed high energy compared with animals fed low energy from 60 to 30 days prior to puberty (Barcellos et al, 2014). Summers et al (2014) reported that conception rates increased in heifers with higher ADG based on corn level supplementation.…”

Section: Discussionmentioning

confidence: 96%

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Relationship of post-weaning growth and age at puberty in crossbred beef heifers

et al. 2017

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-This study was intended to evaluate body size structure and growth parameters of crossbred heifers fed at four nutritional levels to achieve puberty earlier. Animals were classified depending on their level of crossing between Nelore and Hereford and subjected to four nutritional levels (kg day -1 ) as follows: 0.5 (light; n = 32), 0.75 (medium; n = 32), 1.00 (high; n = 29), and 1.25 (very high; n = 27). Heifers at puberty and at weaning were individually classified for growth parameters. The fat thickness and longissimus muscle area throughout the experimental period were determined by ultrasonography. The height, heart girth, frame, and weight:height ratio were variables used to evaluate body traits. Univariate analysis of variance using the GLIM MIXED procedure os SPSS was performed and the significance level was set at 0.05. Age and body weight at puberty were 388±1.9 days and 331.4±1.3 kg, respectively. Body condition score demonstrated an interaction between nutritional level and crossbred degree. Heifers with the highest degree of Nelore had higher fat thickness and lower weight:height ratio compared with other racial groups at puberty. Pearson correlation coefficient showed a negative association for body condition score (-0.34) and fat thickness (-0.58) compared with age at puberty. The increased fat thickness at younger ages at puberty was observed in all racial groups. The increased weight:height ratio at younger ages at puberty was observed in all racial groups. We observed higher values for a frame in animals at the higher level of supplementation. There is a greater correlation between live weight gain and phenotypic traits during weaning to achieve puberty at an earlier age in crossbred heifers.

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Section: Discussionmentioning

confidence: 96%

“…Composition of the supplement used to produce four rates of weight gain (kg day -1 ) were as follows: G500 (n = 32) composed of 4.5 (dry matter (DM) kg animal (G500), 0.75 kg day -1 (G750), 1.0 kg day -1 (G1000), and 1.25 kg day -1 (G1250) from weaning to puberty according to Barcellos et al (2014).…”

Section: Methodsmentioning

confidence: 99%

Relationship of post-weaning growth and age at puberty in crossbred beef heifers

et al. 2017

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“…LW gain in heifers from LW class 55% (0.14 kg day -1 ) was lower than that in heifers from LW class 65% (0.22 kg day -1 ), which in turn was lower than that of animals from LW class 75% (0.43 kg day -1 ). This result helps understand the reproductive performance of heifers at first mating because the rate of LW gain at this stage of development affects the physiological factors that trigger the onset of reproduction and age at puberty (GASSER et al, 2006;COOKE et al, 2008;ALLEN et al, 2012;EBORN et al, 2013;BARCELLOS et al, 2014;FARIAS et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

“…This result is due to animal performance in the phases that preceded the beginning of mating, especially from 18 to 24 months, considering that these phases presented the most significant difference in LW gain in the present study. An unfavorable metabolic condition caused by low nutrient intake reduces the concentration of glucose, insulin, and insulin-like growth factor (IGF-I), compromising the secretion of hypothalamic-pituitary and gonadotrophins in ovarian cells (WHITE et al, 2007;BARCELLOS et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

“…In Brazil, some characteristics of production systems, including the genetic composition of the herd, the nutritional quality of the feed, and low rates of in the second reproductive year, support the recommendation of increasing weight gain at first mating for heifers. Higher weight gain close to the mating period reduces the age at puberty and constitutes a promising strategy for increasing pregnancy rates in zebu herds (BARCELLOS et al, 2014). In addition, the increase in heifer weight in the second reproductive year is relevant because of the return of postpartum estrus .…”

Section: Introductionmentioning

confidence: 99%

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Reproductive performance of heifers of different weight classes in the first and second mating

Pacheco

Brondani

Filho

et al. 2019

SCA

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The objective of this study was to evaluate the effect of live weight at first mating on reproductive performance in the first and second reproductive years. For that purpose, the reproductive history of 221 heifers mated for the first time between the years of 2003 and 2012 was evaluated. Heifers were grouped into three weight classes at the age of 24 months: 50-59.9% (55%), 60-69.9% (65%), and 70-80% (75%). The pregnancy rate in the first reproductive year in heifers from weight classes 55%, 65%, and 75% was 38.0%, 56.4%, and 69.0%, respectively. The pregnancy rate in the second reproductive year was not affected by weight at first mating (p > 0.05) and corresponded to 41.6%; 42.1%, and 50.4% in the three weight classes, respectively. The weight class of heifers before mating at the age of 24 months affected reproductive performance at first mating but did not increase the pregnancy rate in the second reproductive year. ResumoObjetivou-se avaliar o efeito do peso vivo ao primeiro acasalamento de novilhas sobre o desempenho reprodutivo na primeira e segunda monta. Para isso, foi avaliado o histórico reprodutivo de 221 novilhas de corte acasaladas pela primeira vez entre os anos de 2003 até 2012. As novilhas foram agrupadas em três classes de peso vivo aos 24 meses de idade, sendo eles: entre 50 a 59,9% do peso adulto (55%); de 60 a 69,9% do peso adulto (65%) e entre 70 a 80% do peso adulto (75%). A taxa de prenhez no primeiro ano reprodutivo foi de 38,0%; 56,4% e 69,0% às acasaladas com faixa de peso de 55%, 65% e 75%; respectivamente. A taxa de prenhez no segundo ano reprodutivo não sofreu efeito da classe de peso ao primeiro acasalamento (p > 0,05) com valores de 41,6%; 42,1% e 50,4%. A classe de peso antes do acasalamento de novilhas aos dois anos de idade interfere no desempenho reprodutivo na primeira monta, mas não resulta em aumento na taxa de prenhez no segundo ano reprodutivo.

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Performance of beef heifers supplemented with sodium lasalocid

Sartori

Canellas

Pereira

et al. 2016

Trop Anim Health Prod

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This study was conducted on 78 13-month-old crossbred beef heifers that weighed 215 kg in Southern Rio Grande do Sul (RS) State, Brazil. We evaluated the performance of beef heifers that were reared in a pasture system that received a mineral supplement energy-type protein with added sodium lasalocid (LAS). The heifers were randomly and uniformly divided into 2 groups, with 39 animals in each group. One group of animals received a mineral supplement energy-type protein without sodium lasalocid (CON), and the other group received a mineral supplement energy-type protein with added LAS. The mean feed intake, the body weight (BW), the average daily gain (ADG), the body condition score (BCS), and ovarian cyclicity were recorded, and economic parameters were calculated. No differences in supplement intake were observed between the groups, which ensures adequate intake of the other components of the mineral mixture, which are part of the nutritional requirements for the production process. Similarly, no difference in the ADG was observed between treatments. We observed that the heifers in the LAS group had a higher BW gain (51 kg) that the CON heifers (40 kg; P < 0.05). In addition, LAS-supplemented heifers had a higher BCS (3.53) than CON heifers (3.38) at the end of the experiment (P < 0.05). The heifers supplemented with LAS had a higher profitability than the CON heifers, even with the higher cost of the supplement containing LAS; this effect was due to the higher live BW at the end of the study. We concluded that the administration of a mineral supplement energy-type protein with added LAS has beneficial effects on beef heifers in terms of production and economic feasibility.

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Higher feeding diets effects on age and liveweight gain at puberty in crossbred Nelore × Hereford heifers

Cited by 20 publications

References 30 publications

Relationship of post-weaning growth and age at puberty in crossbred beef heifers

Relationship of post-weaning growth and age at puberty in crossbred beef heifers

Reproductive performance of heifers of different weight classes in the first and second mating

Performance of beef heifers supplemented with sodium lasalocid

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