Effect of Low Energy and Protein Intake on Growth and Reproductive Performance of Young Rams

Tilton, W. A.; Warnick, A. C.; Cunha, T. J. F.; Loggins, P. E.; Shirley, R. L.

doi:10.2527/jas1964.233645x

Cited by 11 publications

(11 citation statements)

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“…Goats were studied by Hiroe and Tomizuka (1965), who also found that loss of body mass was associated with reductions in the output of spermatozoa. There were some negative findings too (Tilton et al, 1964), but subsequent studies (Parker and Thwaites, 1972;Braden et al, 1974;Oldham et al, 1978;Alkass et al, 1982;Martin et al, 1987;Cameron et al, 1988) led to the wide acceptance of strong, direct relationships between plane of nutrition, testicular mass and the number of spermatozoa available for ejaculation, for the small ruminants at least (Figure 1). …”

Section: Nutrition and The Production Of Spermatozoamentioning

confidence: 99%

Interactions between nutrition and reproduction in the management of the mature male ruminant

Martin¹,

Blache²,

Miller³

et al. 2010

Animal

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In mature male sheep and goats, changes in feed intake seem to have little effect on gonadal endocrine function but induce profound changes on sperm production. These outcomes are due to changes in size of the seminiferous tubules and in spermatogenic efficiency. Except with severe underfeeding, there are only minor changes in the endocrine function of the testis (testosterone production) unless season-long treatments are imposed. For cattle, nutrition clearly affects testicular development and the production of spermatozoa in young bulls, as it does in other species but, after the period of rapid growth has ended, there appears to be little or no response to nutrition. We are developing a clear picture of the metabolic signals, neuroendocrine processes and hormonal control systems that are involved, particularly for the mature male sheep. The energetic components of the diet, rather than protein, seem to be responsible, so we have envisaged a model of the relationship between energy balance and reproduction that has 4 'dimensions': genotype, structure (organs), communication (chemical and neural signals, nutrient sensing) and time (dynamics, metabolic memory, programming). We have linked these perspectives to 'resource allocation theory' and incorporated them into strategies for 'clean, green and ethical animal production'. In contrast to the clear outcomes with respect to spermatogenesis, the effects of nutrition on sexual behaviour are more difficult to define, perhaps because the behaviour is affected by a complex mix of physiological factors and because of flawed methods for quantifying male behaviour. For example, sexual behaviour is compromised by severe feed restriction, but male sexual behaviour requires intensive motor activity so a decline in libido could be caused by general weakness rather than specific nutritional limitations. The interaction between sexual activity and feeding behaviour also complicates the issue under field conditions. At the other end of the scale, overweight males can show reduced sexual success because they have difficulty courting and mounting. For this reason, exercise can enhance the fertilising capacity of rams. This will be important in extensive mating systems where males need to assemble and guard a harem and then mate many times for several weeks. For artificial insemination centres, there seems to be very few data on the nutritional management of males, but problems with overfed animals appear to be a risk. Future research should concentrate on the intra-testicular systems mediating the effects of nutrition on the production of spermatozoa.

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Section: Nutrition and The Production Of Spermatozoamentioning

confidence: 99%

Interactions between nutrition and reproduction in the management of the mature male ruminant

Martin¹,

Blache²,

Miller³

et al. 2010

Animal

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“…Isso porque, para o melhor aproveitamento das fontes de energia é necessário que haja equilíbrio entre a quantidade e o momento da chegada de proteína e energia no rúmen (Van Soest, 1994) (Tilton et al, 1964). No mesmo estudo os animais foram colocados junto às fêmeas para ser avaliado sua fertilidade (Tabela 2).…”

Section: Influência Da Proteína Sobre Mediadores Nutricionaisunclassified

“…No mesmo estudo os animais foram colocados junto às fêmeas para ser avaliado sua fertilidade (Tabela 2). Embora não tenha sido aplicada análise estatística, o número de ovelhas prenhes entre os tratamentos ficou muito próximo, contudo, deve-se levar em consideração a variação individual de cada reprodutor, uma vez que a taxa de concepção variou de 0até 100% de acordo com o carneiro (Tilton et al, 1964 Alguns pesquisadores têm estudado a restrição alimentar em diferentes fases da vida do animal. Avaliando bovinos recém-desmamados que receberam 14,5 ou 8,5 % de PB, Rekwot et al (1988) observaram que os animais restritos tiveram menor peso corporal, ECC, concentração e motilidade espermática.…”

Section: Influência Da Proteína Sobre Mediadores Nutricionaisunclassified

“…As maneiras de se avaliar a libido ou interesse sexual apresentam algumas variações mesmo dentro da mesma espécie, por vezes sendo utilizado o intervalo entre a coleta por vagina artificial ou eletro estimulação e a monta subsequente (Tilton et al, 1964) e em outras ocasiões o número de montas completas e outros comportamentos de interesse sexual em um determinado espaço de tempo (Salvador et al, 2003). Portanto é difícil estabelecer uma comparação entre os trabalhos encontrados na literatura e chegar a uma conclusão sobre a influência da alimentação sobre o comportamento sexual de machos.…”

Section: Comportamento Sexualunclassified

“…Corroborando com os resultados, Tilton et al (1964) não encontraram diminuição no interesse sexual de ovinos alimentados com 3,2 % de PB em relação aos que receberam 13,1. Já a libido de ovinos foi reduzida quando eles recebem 25% e 50% menos dos nutrientes exigidos para a mantença (Parker & Thwaites, 1972).…”

Section: Comportamento Sexualunclassified

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Protein in ruminant feed: puberty, seminal quality and sexual behavior

Silva¹,

Hatamoto-Zervoudakis²,

Tsuneda³

et al. 2015

Pubvet

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RESUMO.A produção de ruminantes no Brasil é feita predominantemente com animais em pastejo, no entanto, forragens tropicais passam por um período do ano em que o teor de proteína bruta (PB) fica abaixo de 7%, reduzindo a eficiência de utilização dos nutrientes pela microbiota ruminal. Dessa forma, a restrição proteica afeta negativamente a idade à puberdade, qualidade seminal, a concentração sanguínea de insulina e glicose, porém, parece não ter efeito sobre o interesse sexual em ruminantes. Palavras chave: Taxa de crescimento, nutrição, libidoProtein in ruminant feed: puberty, seminal quality and sexual behavior ABSTRACT. Brazilian ruminant production is made predominantly with grazing animals, and, in a dry season of year the crude protein (CP) of tropical forage is below 7% reducing microbial efficiency in using of nutrients from diet. Thus, protein restriction affects negatively the age of puberty, seminal quality, blood concentration of insulin and glucose, but seems to have no effect on sexual interest in ruminants.

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The effect of postweaning level of dietary energy on sex drive and semen quality of young beef bulls

Mwansa

Makarechian

1991

Theriogenology

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Effect of Low Energy and Protein Intake on Growth and Reproductive Performance of Young Rams

Cited by 11 publications

References 0 publications

Interactions between nutrition and reproduction in the management of the mature male ruminant

Interactions between nutrition and reproduction in the management of the mature male ruminant

Protein in ruminant feed: puberty, seminal quality and sexual behavior

The effect of postweaning level of dietary energy on sex drive and semen quality of young beef bulls

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