Reproductive performance of rabbit females from three paternal lines with a different potential for growth rate and resilience

Peixoto-Gonçalves, C.; Martínez-Paredes, E.; Ródenas, L.; Larsen, Torben; Corpa, J. M.; Blas, E.; Cambra‐López, María; Pascual, Juan José Montero

doi:10.1016/j.animal.2023.100729

Cited by 3 publications

(2 citation statements)

References 36 publications

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“…The highest levels of leptin are found at mating. Similar results have been shown in lines selected for daily gain in the fattening period [41]. Leptin can activate the secretion of hypothalamic luteinizing hormone-releasing hormone (LH-RH) [42,43], causing ovulation to be induced by coitus.…”

Section: Discussionsupporting

confidence: 72%

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Changes in Body Reserves, Non-Esterified Fatty Acids, and Leptin during the Reproductive Lifespan of the Rabbit Female

Peiró,

Argente,

García

2023

Animals

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The aim of this work is to study changes in body weight, perirenal fat thickness (PFT), and non-esterified fatty acid (NEFA) and leptin concentrations throughout the reproductive life of the rabbit female and their correlations when a semi-intensive reproductive rhythm is applied. A total of 46 lactating females were used. Body weight, PFT, and NEFA and leptin concentration were recorded at 12 weeks of age, at first mating and delivery, and at second, third, and fourth mating, 12th d of gestation, and delivery. The highest body weight was detected on the 12th d of any gestation, around 4280 g, and the lowest weight was at delivery, around 4030 g. PFT increased until third mating. NEFA and leptin concentration showed a cyclical pattern throughout the reproductive lifespan of the females. NEFAs presented the highest concentration at delivery within each reproductive cycle and levels decreased over the course of the deliveries (0.423 mmol/L at first delivery, 0.406 mmol/L at second delivery, 0.371 mmol/L at third delivery, and 0.309 mmol/L at fourth delivery). Similar NEFA concentrations at mating and on the 12th d of gestation were obtained. Leptin showed the highest concentrations at mating within each reproductive cycle. Leptin decreased between mating and delivery in all reproductive cycles and it was close to 1 ng/mL HE. Low or null correlations were shown between body weight, PFT, and NEFA and leptin concentration at mating, 12th d of gestation, and delivery. In conclusion, females are able to maintain a semi-intensive reproductive rhythm across four parities weighing around 4 kg from first mating. Females had an increased perirenal fat thickness until third delivery, and their NEFA concentration was maximum at delivery and leptin concentration was maximum at mating. Body weight, PFT, and NEFA and leptin concentration should be measured during critical moments of reproductive life in order to determine body condition and energy mobilization, due to their low or null correlations.

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Section: Discussionsupporting

confidence: 72%

“…A substantial increase occurs from mid-gestation, followed by a decline after delivery [45]. A decrease in plasma's leptin levels is usually associated with a reduced reproductive ability and the promotion of body reserve accretion at the expense of milk yield [41].…”

Section: Discussionmentioning

confidence: 99%

Changes in Body Reserves, Non-Esterified Fatty Acids, and Leptin during the Reproductive Lifespan of the Rabbit Female

Peiró,

Argente,

García

2023

Animals

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Growth performance of three paternal rabbit lines with different potential for growth rate and resilience

Peixoto-Gonçalves,

Martínez-Paredes,

Ródenas

et al. 2023

World Rabbit Sci.

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This experiment aimed to compare the growth performance, digestive efficiency and health status of three paternal lines for growing rabbits. The R line was selected by growth rate during the growing period for 37 generations; the RF line was founded by selecting a population of elite R animals (average daily gain>60 g/d); and the RFLP line was founded by backcrossing males from the RF line with females from the LP maternal line. A total of 387 weaned rabbits were used to evaluate growing performance from weaning until 63 d of age in individual cages, in three batches. Additionally, 33 animals were used to determine nutrient digestive efficiency in a digestibility trial. Body weight and feed intake were controlled at weaning (28 d), 46 and 63 d of age. Mortality and morbidity were also monitored daily. During the digestibility trial, feed intake and faeces excretion were controlled daily. Results showed no significant effects of genetic type on body weight, daily feed intake and feed conversion ratio throughout the experiment. However, RF animals had a higher average daily gain from 28 to 46 d of age (+4.4%; P<0.05) compared with R animals, but lower from 46 to 63 d of age (–4.3%; P<0.05). Regarding digestive efficiency, RF and RFLP lines showed slightly higher faecal digestibility for dry matter and gross energy of the diet compared with the R line (+1.3 percentage points; P<0.05). Mortality was higher in animals from R and RF lines compared with RFLP (on av. 25.40 vs. 14.06%; P<0.05). Our results suggest that the RFLP genetic line could be a suitable alternative to the R line, as it shows a similar growth performance but a lower incidence of digestive disorders.

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The Function of Zinc in Animal, Plant, and Human Nutrition

Ozturk

Niazi

Mansoor

et al. 2023

J. Res. Appl. Sci. Biotechnol.

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Zinc is a crucial micronutrient found in food that is essential for the development of all living organisms, it plays a vital role in gene expression and various physical processes, its deficiency can lead to disease onset and reduce crop yield, restrict plant development, and lower the quality of produced goods, zinc is also used in fertilizers and the handling of metals to protect them from oxidation. Additionally, Zinc is important in enhancing the human immune system, and its deficiency can result in hair loss, memory loss, skin disorders, and muscular weakness.

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Reproductive performance of rabbit females from three paternal lines with a different potential for growth rate and resilience

Cited by 3 publications

References 36 publications

Changes in Body Reserves, Non-Esterified Fatty Acids, and Leptin during the Reproductive Lifespan of the Rabbit Female

Changes in Body Reserves, Non-Esterified Fatty Acids, and Leptin during the Reproductive Lifespan of the Rabbit Female

Growth performance of three paternal rabbit lines with different potential for growth rate and resilience

The Function of Zinc in Animal, Plant, and Human Nutrition

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