The Ewe’s Reproductive Performance, Growth Rate and Carcass Quality of Lambs Kept in a Barn vs Those Kept under an Overhead Shelter

Kuznicka, E.; Rant, W.

doi:10.5713/ajas.2012.12451

Cited by 3 publications

(2 citation statements)

References 23 publications

(20 reference statements)

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“…The average age at first parturition is 24 months. The average lifetime fecundity expressed as the number of lambs weaned per ewe per year reaches 1.5 (Kuźnicka et al, 2005;Radzik-Rant et al, 2012;Kuźnicka and Rant, 2013). However, the observations so far have been carried out in warm barn conditions.…”

Section: Introductionmentioning

confidence: 99%

The ovulation rate, plasma progesterone and estradiol concentration, and litter size of a local ewe breed kept in a barn vs. those kept under an overhead shelter

et al. 2016

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Abstract.A herd of sheep (40 heads) was divided into two equal groups: group 1 was kept under an overhead shelter and group 2 in a warm barn. The effect of maintenance on ewe's reproductive performance, corpora lutea and corpora lutea of pregnancy rate, as well as the concentration of plasma progesterone and estradiol in peripheral blood was investigated. At the first laparoscopy fewer corpora lutea than during the following one were observed (P ≤ 0.01). In sheep kept under the overhead shelter, a greater number of corpora lutea were noted. More corpora lutea of pregnancy were observed in group 1 than in the group from the barn. On the first day after mating the average level of progesterone was 190 pg mL −1 , and after 2 weeks it increased to more than 300 pg mL −1 (P ≤ 0.01). The positive correlation between the number of corpora lutea of pregnancy and progesterone concentration (P ≤ 0.01) and the negative correlation (P ≤ 0.01) with number of corpora lutea of pregnancy, as well as between the litter size and estradiol concentration, were observed. Harsh environmental conditions did not cause a significant decrease of the reproduction performance of ewes kept under the overhead shed.

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Section: Introductionmentioning

confidence: 99%

The ovulation rate, plasma progesterone and estradiol concentration, and litter size of a local ewe breed kept in a barn vs. those kept under an overhead shelter

et al. 2016

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“…After slaughter, the carcasses were chilled at 4°C for 24 h. For carcass quality estimation, the methodology recommended by the National Research Institute of Animal Production was used (Krupiński 2009;Kuźnicka and Rant 2013). Kidney with pelvic fat from the left carcass side was removed and weighed to obtain the contents of kidney knob and channel fat (KKCF).…”

Section: Carcass Quality Estimationmentioning

confidence: 99%

Plasma leptin as a predictor for carcass composition in growing lambs

Kuznicka¹,

Gabryszuk²,

Kunowska-Slósarz³

et al. 2016

Can. J. Anim. Sci.

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Abstract:The experiment was conducted on 30 single born Polish Merino ram lambs. At the age of 112 d, 10 ram lambs were slaughtered at 20 kg (group 1), 25 kg (group 2), and 30 kg (group 3) live weight. Plasma leptin increased between 20 and 25 kg, as well as 25 and 30 kg live weight. The differences between group 1 vs. group 3 and group 2 vs. group 3 were statistically important (P < 0.001). The lack of differences in meat content of the pelvic limb between the groups and, at the same time, the lower fat content (P < 0.001) in group 1, plus the higher fat content of the two remaining groups, are evidence of the higher fatness of carcasses in groups 2 and 3. The fat tissues except the subcutaneous fat were significantly related with the leptin concentrations at slaughter. The leptin concentration of lambs slaughtered at 30 kg live weight surpassed significantly the values noted in groups 1 and 2 (P < 0.001). The correlations between leptin and body composition indicate that plasma leptin concentration at 30 kg live weight can be a predictor of body fat. The correlation of meat weight with leptin concentration has shown no statistical differences.

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The Ovulation Rate, Plasma Leptin Concentration, and Litter Size of a Local Ewe Breed Kept in a Barn Versus Those Kept under an Overhead Shelter

2020

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The effect of housing system on ovulation rate, leptin concentration, body weight, condition score and litter size of Żelażnieńska ewes was investigated. The observations were carried out during three successive years on 36 ewes between 2 and 4 years of age. The animals were divided into groups: the experimental group kept in a cold environment under an overhead shelter, and the control group kept in a warm barn. In both groups were ewes with similar age and reproductive performance nearing that of the flock. The average litter size was 1.53 and 1.59, respectively. This difference was not significant. The observation was carried out on the same ewes each year; thus, ewe age varied from 2 to 6 years. The ovulation rate was tasted by laparoscopy (L) on 16 September and 5 October. Blood was taken from each ewe after feeding one day before laparoscopy. The lower number of corpus lutea (p ≤ 0.01) and leptin concentration (p ≤ 0.01) at first L compared with second L was confirmed. The highest litter size (1.8) was shown by ewes at the age of 4 years (p ≤ 0.01). The Pearson correlation of ewe age and plasma leptin concentration was noted (p ≤ 0.05). The Spearman correlation of the condition score with ewe body weight (p ≤ 0.01) and with ewe age (p ≤ 0.05) was confirmed. Żelaźnieńska sheep may be housed in semiopen sheds with no negative impact on their reproduction. This may encourage breeders to develop this branch of livestock production avoiding the high expenses of construction of massive, warm barns.

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The Ewe’s Reproductive Performance, Growth Rate and Carcass Quality of Lambs Kept in a Barn vs Those Kept under an Overhead Shelter

Cited by 3 publications

References 23 publications

The ovulation rate, plasma progesterone and estradiol concentration, and litter size of a local ewe breed kept in a barn vs. those kept under an overhead shelter

The ovulation rate, plasma progesterone and estradiol concentration, and litter size of a local ewe breed kept in a barn vs. those kept under an overhead shelter

Plasma leptin as a predictor for carcass composition in growing lambs

The Ovulation Rate, Plasma Leptin Concentration, and Litter Size of a Local Ewe Breed Kept in a Barn Versus Those Kept under an Overhead Shelter

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