Does dam parity affect the performance of ewe progeny born to 2-year-old ewes?
P. R. Kenyon A B , S. T. Morris A , H. T. Blair A and K. J. Stafford AA Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11222, Palmerston North, New Zealand.
B Corresponding author. Email: p.r.kenyon@massey.ac.nz
Australian Journal of Experimental Agriculture 48(7) 979-983 https://doi.org/10.1071/EA07392
Submitted: 7 December 2007 Accepted: 20 March 2008 Published: 20 June 2008
Abstract
An increasing number of ewe lambs are being presented for breeding in New Zealand, resulting in more two-tooth ewes of second parity compared with the more normal first parity. The effect of this on the resulting ewe progeny is unknown but is of interest as they are potential replacement ewes. This study was designed to determine if parity of Romney two-tooth ewes had any effect on their ewe lamb progeny to 20 months of age. Two-hundred and fifty female progeny born to two-tooth dams, which had lambed as a ewe lamb (n = 97), failed to conceive at ewe lamb breeding (n = 79), or had not been presented for breeding as a ewe lamb (n = 74), were weighed at regular intervals. The progeny also had onset of puberty and two-tooth breeding and pregnancy scanning performance measured. There were no effects of dam group on liveweight, condition score, 18-month breeding performance or pregnancy diagnosis. However, ewe lambs born to dams which failed to conceive as ewe lambs themselves were less likely (P < 0.05) to achieve puberty. In comparison with single-born lambs, twin-born ewes were lighter (P < 0.05) during their first year of age only. Birth rank had no effect on puberty onset or 18-month breeding performance. These findings indicate that ewe progeny born to second parity two-tooths or two-tooths, which were not presented for breeding as a ewe lamb, do not differ in their productive performance and that either group are suitable as replacement ewes. However, progeny born to two-tooth dams, which failed to conceive as a ewe lamb, would be less suitable as replacement ewes in production systems where ewe lamb breeding is an integral component of the system. Further studies are required to determine if similar relationships would be observed under differing environmental conditions and with different breeds.
Additional keywords: growth, selection.
Acknowledgements
The authors wish to acknowledge the funding provided by Massey University and the National Research Centre for Growth and Development.
Baker RL,
Steine TA,
Våbenø AW,
Bekken A, Gjedrem T
(1978) Effect of mating ewe lambs on lifetime productive performance. Acta Agriculturae Scandinavica 28, 203–217.
Ch’ang TS, Rae AL
(1970) The genetic basis of growth, reproduction, and maternal environment in Romney ewes. I. Genetic variation hogget characters and fertility of the ewe. Australian Journal of Agricultural Research 21, 115–129.
| Crossref | GoogleScholarGoogle Scholar |
Dwyer CM,
Calvert SK,
Farish M,
Donbavand J, Pickup HE
(2005) Breed, litter and parity effects on placental weight and placentome number, and consequences for the neonatal behavior of the lamb. Theriogenology 63, 1092–1110.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
PubMed |
Dyrmundsson OR
(1973) Puberty and early reproductive performance in sheep. 1. Ewe lambs. Animal Breeding Abstracts 41, 273–289.
Gardner DS,
Buttery PJ,
Daniel Z, Symonds ME
(2007) Factors affecting birthweight in sheep: maternal environment. Reproduction (Cambridge, England) 133, 297–307.
|
CAS |
PubMed |
Gonzalez R,
Bonnet R,
Guerra JC, Labuonora D
(1986) Lifetime productivity of single- and twin-born Corriedale sheep and their dams. Australian Journal of Experimental Agriculture 26, 631–637.
| Crossref | GoogleScholarGoogle Scholar |
Gootwine E,
Spencer TE, Bazer FW
(2007) Litter-size-dependant intrauterine growth restriction in sheep. Animal 1, 547–564.
| Crossref | GoogleScholarGoogle Scholar |
Jefferies BC
(1961) Body condition scoring and its use in management. Tasmanian Journal of Agriculture 32, 19–21.
Joffe M, Barnes B
(2000) Do parental factors affect male and female fertility? Epidemiology (Cambridge, Mass.) 11, 700–705.
|
CAS |
PubMed |
Kenyon PR,
Morel PCH, Morris ST
(2004a) The effect of individual liveweight and condition scores of ewes at mating on reproductive and scanning performance. New Zealand Veterinary Journal 52, 230–235.
|
CAS |
PubMed |
Kenyon PR,
Pinchbeck GL,
Perkins NR,
Morris ST, West DM
(2004b) Identifying factors which maximise the lambing percentage of hoggets: a cross sectional study. New Zealand Veterinary Journal 52, 371–377.
|
CAS |
PubMed |
Kenyon PR,
Morel PCH,
Morris ST, West DM
(2005) The effect of individual liveweight and use of teaser rams prior to mating on the reproductive performance of ewe hoggets. New Zealand Veterinary Journal 53, 340–343.
|
CAS |
PubMed |
Kenyon PR,
Proctor L,
Morris ST, West DM
(2008) Lambing as a hogget negatively affects two-tooth ewe reproductive performance. Livestock Science in press. ,
McCall DG, Hight GK
(1981) Environmental influences on hogget lambing performance and the relationship between hogget and two-tooth lambing performance. New Zealand Journal of Agricultural Research 24, 145–152.
Notter DR,
Borg RC, Kuehn LA
(2005) Adjustment of lamb birthweight and weaning weight weights for continuous effects of ewe age. Animal Science (Penicuik, Scotland) 80, 241–248.
| Crossref | GoogleScholarGoogle Scholar |
Ong KKL,
Preece MA,
Emmett PM,
Ahmed ML, Dunger DB
(2002) Size at birth and early childhood growth in relation to maternal smoking, parity and infant breast-feeding: longitudinal birth cohort study and analysis. Pediatric Research 52, 863–867.
| PubMed |
Symonds ME,
Pearce S,
Bispham J,
Gardner DS, Stephenson T
(2004) Timing of nutrient restriction and programming of fetal adipose tissue development. The Proceedings of the Nutrition Society 63, 397–403.
| Crossref | GoogleScholarGoogle Scholar | PubMed |
Tyrrell RN
(1976) Some effects of pregnancy in eight-month-old Merino ewes. Australian Journal of Experimental Agriculture and Animal Husbandry 16, 458–461.
| Crossref | GoogleScholarGoogle Scholar |
Wilcox MA,
Change AM, Johnson IR
(1996) The effects of parity on birthweight using successive pregnancies. Acta Obstetricia et Gynecologica Scandinavica 75, 459–463.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
PubMed |
Wu G,
Baser FW,
Wallace JM, Spencer TE
(2006) Intrauterine growth retardation: implications for animal sciences. Journal of Animal Science 84, 2316–2337.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
PubMed |
