Voluntary intake of dry matter and performance of Nellore cows and their Nellore and crossbred Simental × Nellore calves

Vargas, Fernando Miranda de; Wechsler, Francisco Stéfano; Rossi, Patricia; Oliveira, Marcus Vinícius Morais de; Schmidt, Patrick

doi:10.1590/s1516-35982011001100040

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…In contrast, VARGAS JUNIOR et al (2011), who measured milk intake (kg) as a function of calf age (days), observed a decline throughout the preweaning period. In the present study, the milk production of cows was measured only three times during lactation and the MI of calves was based on this production, a fact that might explain the difference to the results reported by VARGAS JUNIOR et al (2011). The methodology used to measure the milk production of cows (WALKER et al, 2015); although, very laborious, can still be criticized.…”

Section: Discussionmentioning

confidence: 92%

“…(2018), in grazing Nellore cows, determined that the proportion of total daily production represented by the ratio of afternoon/morning milking was 0.45 in early lactation (first third) and 0.41 in mid-and late lactation, and concluded that it is not accurate to multiply a once daily milking amount in order to calculate daily milk production. Despite the limitation of the methodology, it is also known that the maximum production of a beef cow can also be determined by the calf's ability to extract the milk produced and not only by cow's physiological ability to produce milk (VARGAS JUNIOR et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

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Residual feed intake of Nellore calves is not repeatable across pre and post weaning periods

Souza

Bis

Sakamoto³

et al. 2021

Cienc. Rural

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This study measured milk and solid feed intake in pre- weaning period and feed intake in postweaning period of Nellore calves, and to correlated them with performance traits and ingestive behavior of animals classified as most and least efficient. During pre weaning phase, feed efficiency was evaluated in 51 cow-calf pairs from 21±5 days after calving until weaning. During post-weaning phase, only male calves (n=23) were evaluated. Pre-weaning milk intake of calves was estimated based on cow’s milk production. Pre-weaning daily metabolizable energy intake (MEI) of calves was estimated as the sum of MEI from milk and solid diet. There was no difference in ADG between calves with negative and positive pre RFI, with a consequent better feed conversion to more efficient calves. The most efficient calves spent less time at the feed bunk, with a shorter feeding duration and higher rate of intake, compared to the least efficient animals. Correlations between feed intake and metabolic body weight of the animals during pre- and postweaning phases were positive, of medium to high magnitude, and significant, while correlation between ADG values was close to zero. Results suggested that part of the animals ranked based on pre weaning feed intake won’t maintain their rank during postweaning phase. In conclusion, calves classified as most efficient during pre-weaning phase have similar weight gain but lower milk intake and MEI than least efficient animals. The estimated pre RFI is weakly correlated with post RFI, showing that RFI is not consistent or repeatable across two periods.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Residual feed intake of Nellore calves is not repeatable across pre and post weaning periods

Souza

Bis

Sakamoto³

et al. 2021

Cienc. Rural

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“…According to Vargas Junior et al (2011), milk yield may be increased as the calf stimulates the mammary gland. A high frequency of suckling could make the cow increase milk yield in response to higher stimulation; as result, this may reduce her body condition.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of supplementation plans for suckling beef calves managed on tropical pasture

Lopes

Paulino

Detmann

et al. 2017

SCA

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This study assessed the effects of different amounts of supplement on the productive performance, nutrional caracteristics and behaviour of suckling beef calves, as well as on the productive performance of their dams on tropical pastures. Forty-four male Nellore beef calves with an average age of 120 days and an initial average body weight (BW) of 145±3.7 kg and their respective dams, with an average BW of 449±6.9 kg, were used. The amounts of supplement evaluated were as follows: 0 = calves received only mineral mixture ad libitum; 3, 6, and 9 = calves received 3, 6, or 9 g kg -1 BW of supplement, respectively, containing 250 g CP kg -1 (as-fed). The experimental design was completely randomized. A positive linear effect (P < 0.01) was observed in the intakes of dry matter and organic matter, and a cubic effect (P < 0.07) was observed for the intake of neutral detergent fiber corrected for ash and protein.There was quadratic effect (P < 0.06) for total digestibility of neutral detergent fiber. A cubic effect (P < 0.01) was observed for the calves' performance. However, the calves' supplementation did not affect the milk yield and performance (P ≥ 0.21) of their dams. The supplementation decreased grazing time (P < 0.01) but did not influence suckling time (P ≥ 0.59). It is recommended supplying of supplement containing 250 g CP kg -1 (as-fed) in amount 6 g kg -1 BW to suckling beef calves managed in tropical pasture. Supplementation of suckling beef calves increases the intake of dry matter, decreases grazing time and forage intake. However, it does not affect the suckling time and productive performance of their dams. Key words: Behavior. Calves. Creep feeding. Nellore. Supplementation. ResumoEste estudo avaliou os efeitos de diferentes quantidades de suplemento sobre o desempenho, características nutricionais e comportamentais de bezerros de corte lactentes, bem como o desempenho de suas mães em pasto tropical. Foram utilizados quarenta e quatro bezerros de corte lactentes machos da raça Nelore com idade média de 120 dias e peso corporal médio de 145±3,7 kg, e suas respectivas mães, com peso corporal médio de 449±6,9 kg. As quantidades de suplemento avaliadas foram as seguintes: 0 = bezerros receberam somente mistura mineral ad libitum; 3, 6 ou 9 = bezerros receberam 3, 6 ou 9 g kg -1 PC de suplemento contendo 25 g de PB kg -1 (matéria natural). O delineamento experimental foi inteiramente casualizado. Foi observado efeito linear positivo (P < 0,01) para o consume de matéria seca e matéria orgânica, e um efeito cúbico (P < 0,07) foi observado para o consume de fibra em detergente neutro (FDN). Houve um efeito quadrático (P < 0,06) para a digestibilidade total da FDN. Observou-se efeito cúbico (P < 0,01) quanto ao desempenho dos bezerros. No entanto, a suplementação não afetou (P ≥ 0,21) a produção de leite e o desempenho de suas mães. A suplementação diminuiu o tempo de pastejo (P < 0,01), mas não influenciou (P ≥ 0,59) o tempo de amamentação dos bezerros. Recomenda-se o fornecimento de suplemento con...

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What do calves choose to eat and how do preferences affect behaviour?

Webb

Engel

Berends

et al. 2014

Applied Animal Behaviour Science

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Voluntary intake of dry matter and performance of Nellore cows and their Nellore and crossbred Simental × Nellore calves

Cited by 4 publications

References 17 publications

Residual feed intake of Nellore calves is not repeatable across pre and post weaning periods

Residual feed intake of Nellore calves is not repeatable across pre and post weaning periods

Evaluation of supplementation plans for suckling beef calves managed on tropical pasture

What do calves choose to eat and how do preferences affect behaviour?

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