Modelling the lactation curve of rabbit does: Towards a model including fit suitability and biological interpretation

Casado, C.; Piquer, O.; Cervera, C.; Pascual, Juan José Montero

doi:10.1016/j.livprodsci.2005.05.019

Cited by 21 publications

(24 citation statements)

References 20 publications

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“…Feed intake and faecal collections were recorded daily just after the milk production measurement (using the does double weight method) from the 14 th to 18 th day of lactation. This period was selected to perform the digestibility trial, as it corresponds to the period of maximum milk yield in rabbit does (Casado et al, 2006) and is characterised by a regular females' feed intake. The chemical analyses of diets and faeces for DM, crude protein (CP), ADF, acid detergent lignin (ADL) and ash followed the AOAC methods (934.01, 976.05, 973.18 and 942.05, respectively;AOAC, 2000).…”

Section: Methodsmentioning

confidence: 99%

Digestive efficiency in rabbit does according to environment and genetic type

Savietto¹,

Blas²,

Cervera³

et al. 2012

World rabbit sci.

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ABSTRACT:Ninety lactating rabbit does of 3 different genetic types [2 from a line differentiating 20 generations by selection for litter size at weaning (V16 and V36) and 1 from a line founded under reproductive longevity criteria and then selected by litter size at weaning (LP)] were subjected to 3 environmental conditions: NC, females housed under normal conditions (14 to 20°C) and fed with a control diet [333 g neutral detergent fibre (NDF)/kg dry matter (DM)]; HC, females housed under heat conditions (25 to 35°C) and fed with the control diet; or NF, females housed under normal conditions and fed with a fibrous diet (443 g NDF/kg DM). The apparent digestible coefficients of dry matter (DMd), organic matter, crude protein (CPd), gross energy, NDF (NDFd) and acid detergent fibre, as well as the daily intake of DM, digestible protein and digestible energy (DE), were determined (14 to 18 d post-partum). The environment affected all variables analysed. In general, heat conditions reduced the daily DM intake (around -30%; P<0.05) and increased main apparent digestible coefficients (+4.5 percentage points for DMd). In contrast, the use of a fibrous diet led to reduce DE intake (-217 kJ/d; P<0.05) and main apparent digestibility coefficients (-13.5 percentage points for DMd). Females from line V, regardless of generation, showed lower daily DM intake (-19.2 g/d; P<0.05) and NDFd (-1.5 percentage points; P<0.05) than line LP. Interactions between genetic type and environment were found for daily DM intake, NDFd and CPd. When receiving fibrous diet, LP females showed a higher increment in daily DM intake (+65.6 g/d; P<0.05) than V36 females, compared to control. Under heat conditions, NDFd obtained for LP females were higher to those in normal conditions (+3.14 percentage points), while V females showed similar NDFd. In addition, the increase in CPd observed under heat conditions was higher for LP (+9.87 percentage points) and V36 (+8.74 percentage points) than V16 females (+3.84 percentage points). In conclusion, rabbit females from a line founded for reproductive longevity seem to show a higher flexibility in their digestive capacity under constrained conditions.

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Section: Methodsmentioning

confidence: 99%

Digestive efficiency in rabbit does according to environment and genetic type

Savietto¹,

Blas²,

Cervera³

et al. 2012

World rabbit sci.

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“…The top lactation is situated on day 18-19 after kindling (Lebas, 1968;Maertens and De Groote, 1991;Fortun-Lamothe and Sabater, 2003;Casado et al, 2006). However, in case of deficiencies in aminoacid supply (De Blas et al, 1995;Taboada et al, 1994) or when primiparous does are submitted to the intensive reproduction rhythm, the lactation peak is reached 2-3 days earlier (Maertens and De Groote, 1991;Xiccato et al, 1995;Pascual et al, 1999b).…”

Section: Lactation Stagementioning

confidence: 99%

“…The most important was the total daily amount, followed by a factor expressing the asymmetry of the curve and finally a factor determining the amplitude of the curve, explaining respectively 58.3, 10.1 and 5.8% of the variability. Lauridsen and Danielsen (2004) Recently Casado et al (2006) proposed different empirical models for the 28-day lactation curve, based on 550 lactation records. The beta-modified equation had a better fit suitability than the quadratic model and the advantage of a greater biological interpretation of its parameters.…”

Section: Lactation Stagementioning

confidence: 99%

“…The beta-modified equation had a better fit suitability than the quadratic model and the advantage of a greater biological interpretation of its parameters. The following prediction model is proposed (Casado et al, 2006):…”

Section: Lactation Stagementioning

confidence: 99%

“…When females are submitted to the usual semi-intensive reproductive system with AI 11 days postpartum, the milk yield is only slightly decreased from day 25 off compared to females inseminated after weaning (Szendrö et al, 1985;Casado et al, 2006). The decrease is limited to around 25 g during the last days of a 28-day lactation period.…”

Section: Gestation Overlapping Degreementioning

confidence: 99%

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Rabbit milk: A review of quantity, quality and non-dietary affecting factors

Maertens¹,

Lebas²,

Szendrő³

2010

World rabbit sci.

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This literature review focuses on the milk yield and milk composition of rabbits and the non-nutritional factors affecting both quantity and quality. Actual highly efficient hybrid does have an average daily milk yield of 250 g or 60 g/kg of live weight during the 4-weeks lactation period. However, compared with cow and sow milk, rabbit's milk is much more concentrated in fat (12.9 g/100 g), protein (12.3 g/100 g) and energy (8.4 MJ/kg) which explains the extremely rapid growth of the young (weight × 6 after 3 weeks). Characteristic of rabbit milk is also the nearly absence of lactose (<2 g/100 g). At peak lactation, protein output per kg metabolic weight (13.4 g/day/kg 0.75 ) exceeds even those of Holstein milk cows. The non-nutritional factors having the largest impact on the milk yield are the number of suckling kits, the parity order (primiparous vs. multiparous) and the gestation overlapping degree (rapid decline after 17-20 days of gestation). However, also through the reduction of feed intake, heat stress has a detrimental impact especially when the night temperature remains above 25°C. Rabbit milk lipids are highly saturated (70.4% SFA) due to the high content of C 8:0 -C 12:0 (50% of total FA) and further characterised by nearly equal quantities of oleic and linoleic acid and an w-6/w-3 ratio around 4. Finally some data about the amino acid, milk proteins including the immmunoglobulins, mineral and vitamin composition are presented.

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Increasing food intake affects digesta retention, digestibility and gut fill but not chewing efficiency in domestic rabbits (Oryctolagus cuniculus)

Findeisen

Südekum

Fritz³

et al. 2021

J Exp Zool Pt A

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In ruminants, the level of food intake affects net chewing efficiency and hence faecal particle size. For nonruminants, corresponding data are lacking. Here, we report the effect of an increased food intake of a mixed diet in four domestic rabbit does due to lactation, and assess changes in particle size (as determined by wet sieving analysis) along the rabbit digestive tract. During lactation, rabbits achieved a distinctively higher dry matter intake than at maintenance, with a concomitant reduction in mean retention times of solute and particle markers, an increase in dry matter gut fill, a reduction in apparent digestibility of dry matter, and an overall increase in digestible dry matter intake. By contrast, there was no change in faecal mean particle size (mean ± SD: 0.58 ± 0.02 vs. 0.56 ± 0.01 mm). A comparison of diet, stomach content and faecal mean particle size suggested that 98% of particle size reduction occurred due to ingestive mastication and 2% due to digestive processes.Very fine particles passing the finest sieve, putatively not only of dietary but mainly of microbial origin, were particularly concentrated in caecum contents, which corresponds to retention of microbes via a 'wash-back' colonic separation mechanism, to concentrate them in caecotrophs that are re-ingested. This study gives rise to the hypothesis that chewing efficiency on a consistent diet is not impaired by intake level in nonruminant mammals.

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Modelling the lactation curve of rabbit does: Towards a model including fit suitability and biological interpretation

Cited by 21 publications

References 20 publications

Digestive efficiency in rabbit does according to environment and genetic type

Digestive efficiency in rabbit does according to environment and genetic type

Rabbit milk: A review of quantity, quality and non-dietary affecting factors

Increasing food intake affects digesta retention, digestibility and gut fill but not chewing efficiency in domestic rabbits (Oryctolagus cuniculus)

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