A review of the effects of supplementary nutrition in the ewe on the concentrations of reproductive and metabolic hormones and the mechanisms that regulate folliculogenesis and ovulation rate

Scaramuzzi, Rex; Campbell, Bruce; Downing, J. A.; Kendall, N.R.; Khalid, M.; Muñoz-Gutiérrez, M.; Somchit, M. N.

doi:10.1051/rnd:2006016

Cited by 315 publications

(278 citation statements)

References 40 publications

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“…This was the same for twins (p<0.05). The current results regarding kid growth emphasised the importance of additional feeding before mating and during lactation in extensive goat farming (Martin et al 2004;Scaramuzzi et al 2006;Sultana et al 2012). It has been reported that the nutritional level in maternal feeding during pregnancy affected the number of secondary muscle fibres in striated muscle tissue in foetus which had an effect on birth weight (Dwyer et al 1994;Tygesen & Harrison 2005;Tygesen et al 2007).…”

Section: Resultsmentioning

confidence: 81%

Effects of supplemental feeding on performance of Kilis goats kept on pasture condition

Gül

Keskin

Göçmez³

et al. 2016

Italian Journal of Animal Science

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In this study, the effects of supplemental feeding to extensive pasture condition on some reproductive and milk yield characteristics in Kilis goats have been investigated. For this study, 180 Kilis goats were used. These goats were assigned into two groups as control and treatment. Control goats were allowed to graze pasture, while treatment goats were additionally fed 750 g/day with concentrated feed per head plus pasture facility. At the end of the study the average fertility rate, marketable milk yield, lactation length and lactation milk yield were determined as 115.56%, 215.5 6 5.28 l, 212.5 6 1.09 days 293.7 6 5.76 l, respectively, in the control goats; 131.1%, 304.1 6 6.48 l, 256.5 6 1.79 days, 408.3 6 7.21 l, respectively, in the treatment goats. To conclude, supplementary feeding plus pasture improved reproductive and milk yield performance in Kilis goats. ARTICLE HISTORY

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Section: Resultsmentioning

confidence: 81%

Effects of supplemental feeding on performance of Kilis goats kept on pasture condition

Gül

Keskin

Göçmez³

et al. 2016

Italian Journal of Animal Science

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“…This suggests that there are nutritional inputs, perhaps some form of 'nutrient sensing or signalling' that are not associated with whole body energy status but can nevertheless stimulate the hypothalamic-pituitary-gonadal axis. At gonadal level, the ovarian follicles of sheep respond strongly to direct inputs from glucose, fatty acids and a number of metabolic hormones, and there are local intra-follicular nutrient sensing and integrative pathways and mechanisms that modulate gonadotrophin-stimulated folliculogenesis and regulate ovulation rate (review: Scaramuzzi et al, 2006). This concept has not been tested for the testis of the sheep.…”

Section: Dimension 3 -The Communication Dimensionmentioning

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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“…The breeding season is stimulated by a reduction in the hours of daylight (negative photoperiod), with the largest percentage of conceptions occurring in autumn and winter. Conception within autumn and winter results in kidding during spring, when feed supply and environmental conditions are usually most favourable (Scaramuzzi et al, 2006;Fatet et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Comparison of follicular dynamics and hormone profiles in Boer goats examined during the breeding and non-breeding seasons in the tropics of Queensland, Australia

Nogueira

Cavalieri

Gummow

et al. 2015

Small Ruminant Research

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Abstract. This study aimed to describe ovarian follicular dynamics in Boer goats (n = 14) during the breeding and non-breeding seasons in the tropics of Queensland. Progesterone profiles and follicular dynamics were compared over a 21-day period in the non-breeding season and one oestrous cycle in the breeding season. Between September and October, 100% of goats were in anoestrus while between April and May they were all undergoing ovulatory cycles. The number of follicular waves during a 3-week period of monitoring was greater during the non-breeding compared to the breeding season (4.8  0.1 vs 4.1  0.1, respectively; P < 0.05), while the number of codominant follicles (5.6  0.3 vs 6.8  0.3, respectively; P < 0.05), growth rate (0.61  0.05 mm/day vs 0.81  0.05 mm/day, respectively; P < 0.05) and the diameter of the largest follicle measured within follicular waves (6.7  0.1 mm vs 7.8  01 mm, respectively; P < 0.05) were less in the non-breeding compared to the breeding season. During the breeding season the interovulatory interval was 19.7  0.2 days. Total number of small follicles (2 to 3 mm) and the total number of follicles ≥3 mm from Days 2 to 14 of the period of examination were greater (P < 0.05) during the non-breeding compared to the breeding season. In the breeding season, 35.7% of cycling goats showed large anovulatory follicles, which persisted and became luteinized. Ovulatory follicles were derived from the fourth follicular wave in 71% of goats. These results have described differences in characteristics of follicular development in the same Boer goats examined during the breeding and non-breeding seasons. In the non-breeding season, the ovaries remained active and follicles continued to grow to reach the equivalent size of preovulatory follicles. Follicular dynamics in the * Corresponding author. +61 4 8894 3333. Email addresses: daniel.nogueira@embrapa.br , daniel.maianogueira@my.jcu.edu.au 2 breeding season was characterised by the development of larger follicles and greater follicular growth rates. Short oestrous cycles and follicular cysts may reduce ovulation rate in Boer goats in the breeding season.

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A review of the effects of supplementary nutrition in the ewe on the concentrations of reproductive and metabolic hormones and the mechanisms that regulate folliculogenesis and ovulation rate

Cited by 315 publications

References 40 publications

Effects of supplemental feeding on performance of Kilis goats kept on pasture condition

Effects of supplemental feeding on performance of Kilis goats kept on pasture condition

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

Comparison of follicular dynamics and hormone profiles in Boer goats examined during the breeding and non-breeding seasons in the tropics of Queensland, Australia

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