EurekaMag
+ Translate
+ Most Popular
The pigeon tick (Argas reflexus): its biology, ecology, and epidemiological aspects
Prevalence of hemoglobin abnormalities in Kebili (Tunisian South)
Lipogranuloma: a preventable complication of dacryocystorhinostomy
Value of basal plasma cortisol assays in the assessment of pituitary-adrenal insufficiency
Bees from the Belgian Congo. The acraensis group of Anthophora
Placing gingival retraction cord
Total serum IgE, allergy skin testing, and the radioallergosorbent test for the diagnosis of allergy in asthmatic children
Acariens plumicoles Analgesoidea parasites des oiseaux du Maroc
Injuries of terminal phalanges of the fingers in children
Biology of flowering and nectar production in pear (Pyrus communis)
Das Reliktvorkommen der Aspisviper (Vipera aspis L.) im Schwarzwald
Hydrological modelling of drained blanket peatland
Pathologic morphology and clinical significance of the anomalous origin of the left circumflex coronary artery from the right coronary artery. General review and autopsy analysis of 30 cases
Cyto genetic analyses of lymphocyte cultures after exposure to calcium cyclamate
Axelrodia riesei, a new characoid fish from Upper Rio Meta in Colombia With remarks concerning the genus Axelrodia and description of a similar, sympatric, Hyphessobrycon-species
Favorable evolution of a case of tuberculosis of pancreas under antibiotic action
RIFM fragrance ingredient safety assessment, Valencene, CAS Registry Number 4630-07-3
Parenteral microemulsions: an overview
Temperate pasture: management for grazing and conservation
Evaluation of a new coprocessed compound based on lactose and maize starch for tablet formulation
Thermal expansion and cracking of three confined water-saturated igneous rocks to 800C
Revision of the genera of the tribe Stigmoderini (Coleoptera: Buprestidae) a discussion of phylogenetic relationships
Anal tuberculosis. Report of a case
Gastric tuberculosis in the past and present
Adaptive responses of the cardiovascular system to prolonged spaceflight conditions: assessment with Holter monitoring

Age, body weight and backfat thickness at first observed oestrus in crossbred Landrace x Yorkshire gilts, seasonal variations and their influence on subsequence reproductive performance


Age, body weight and backfat thickness at first observed oestrus in crossbred Landrace x Yorkshire gilts, seasonal variations and their influence on subsequence reproductive performance



Animal Reproduction Science 99(1-2): 167-181



ISSN/ISBN: 0378-4320

PMID: 16765000

DOI: 10.1016/j.anireprosci.2006.05.004

The objective of the present study was to investigate puberty attainment in crossbred Landrace x Yorkshire (LY) gilts reared under tropical conditions and their subsequent reproductive performance. This study was carried out in a 2400-sow herd over a 1-year period. A total of 696 crossbred LY replacement gilts were included. Faecal samples from 214 gilts were collected to determine the faecal progesterone profiles around the time of first oestrus. Solid-phase 125I-radioimmunoassay was used to determine the progesterone concentrations in the faecal extract. The gilts entered the herd at an average age of 177.5 +/- 12.6 days, 95.7 +/- 10.2 kg body weight (BW) and a backfat thickness (BF) of 12.0 +/- 2.9 mm. On average, the gilts expressed first standing oestrus at 195 days of age, 106 kg of BW and a BF of 13.0 mm. The interval from entry to the gilt pool to the first observed oestrus (EOI) was 24.4 +/- 18.0 days (range 0-88 days). The hormonal profile indicated that the gilts that actually ovulated during the first observed oestrus was 34% (group A), the gilts that had ovulated before the first observed oestrus was 21% (group B) and the gilts that did not ovulate during the first observed oestrus was 45% (group C). During summer the proportion of group A gilts was significantly lower than during the winter and the rainy seasons (P < 0.05). The BW of gilts at entry significantly correlated with the BF at entry (r = 0.31, P < 0.001), the age at entry (r = 0.47, P < 0.001), the BW at first oestrus (r = 0.65, P < 0.001) and the BF at first oestrus (r = 0.33, P < 0.001). An increase of BW at entry of 1 kg resulted in a decrease of EOI of 0.28 days. The age, BW and BF of gilts at the first observed oestrus significantly influenced the total number of piglets born per litter (TB) and the number of piglets born alive per litter (BA) in the first three parities. Gilts expressing their first oestrus between 181 and 200 days had a significantly larger TB than gilts that expressed first oestrus between 150 and 180 days (P = 0.03) and between 201 and 220 days (P = 0.003). Gilts that showed first oestrus between 110.1 and 120.0 kg had a larger TB and BA than gilts that showed first oestrus between 80.0 and 100.0 kg (P < 0.05). Gilts that showed first oestrus with a BF between 13.1 and 15.0 mm had a larger TB and BA than gilts that showed first oestrus with a BF between 11.1 and 13.0 mm (P < 0.05). Group A gilts had a significantly larger TB than group B (10.5 piglets/L versus 9.4 piglets/L, P = 0.02), while farrowing rate (FR) did not differ significantly among groups A, B and C (78.1, 76.9 and 77.6%, respectively). Gilts that farrowed in the summer had a larger TB and BA than gilts that farrowed in the winter (TB, P = 0.03; BA, P = 0.09) and the rainy season (TB, P = 0.006; BA, P = 0.003). In conclusion, LY gilts reared under tropical conditions expressed first standing oestrus at 195 days of age, 106 kg BW and a BF of 13.0 mm. Under field conditions, 21% of the gilts with an observed oestrus had ovulated. The proportion of gilts that showed first oestrus and ovulated normally was lowest during the summer. The age, BW and BF at first observed oestrus influenced subsequent reproductive performance over the first three parities. The mean litter size (TB and BA) in the first three parities were highest in gilts that had a first observed oestrus between 181 and 200 days with 110.1-120.0 kg BW and 13.1-15.0 mm BF.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 048198043

Download citation: RISBibTeXText

Related references

The association between growth rate, body weight, backfat thickness and age at first observed oestrus in crossbred Landrace—Yorkshire gilts. 2009

The association between growth rate, body weight, backfat thickness and age at first observed oestrus in crossbred Landrace x Yorkshire gilts. Animal Reproduction Science 110(1-2): 108-122, 2009

Seasonal variation on age at first observed oestrus in Landrace x Yorkshire crossbred gilts in Thailand. Reproduction in Domestic Animals 43: 124, 2008

Growth and backfat thickness at seven months of age in Duroc X Yorkshire, Landrace X Yorkshire and Yorkshire gilts. Ciencia y Tecnica en la Agricultura, Ganado Porcino 2(1): 5-12, 1979

The effect of body weight, backfat thickness and LD muscle height at first breeding in gilts on their reproductive performance over three subsequent parities. Prace i Materiay Zootechniczne, Zeszyt Specjalny 13: 131-138, 2002

Performance test on growth of Landrace x Yorkshire crossbred gilts. Journal of the Chinese Society of Animal Science 22(3): 259-270, 1993

Effects of season, outdoor climate and photo period on age at first observed estrus in Landrace x Yorkshire crossbred gilts in Thailand. Livestock Science 144(1-2): 163-172, 2012

Influence of Backfat Thickness and the Interval from Altrenogest Withdrawal to Estrus on Reproductive Performance of Gilts. Animals: An Open Access Journal from Mdpi 11(5), 2021

Influence of Backfat Thickness on Reproduction Parameters in Czech Landrace Gilts. Reproduction in Domestic Animals 44: 129, 2009

Genetic and phenotypic correlations between backfat thickness and weight at 28 weeks of age, and reproductive performance in primiparous Landrace sows raised under tropical conditions. Tropical Animal Health and Production 54(1): 43, 2022

Weight, age off-test and backfat thickness in purebred and crossbred boars, barrows and gilts. Revista da Sociedade Brasileira de Zootecnia 22(3): 389-398, 1993

Influence of growth rate, backfat thickness and meatiness on reproduction efficiency in Landrace gilts. Czech Journal of Animal Science 50(12): 535-544, 2005

Influence of growth rate, backfat thickness and meatiness on reproduction efficiency in Landrace gilts. Czech Journal of Animal Science 50(12): 535-544, 2005

Reproductive performance of crossbred Landrace X Yorkshire females. Revista Cubana de Reproduccion Animal 3(1): 49-52, 1977

Comparison of finishing weight and backfat thickness in four pig breeds (Yorkshire, Hampshire, Landrace and Duroc-Jersey) in a commercial herd in north-eastern Mexico. Veterinaria, Mexico 17(1): 63-64, 1986