Genetic and phenotypic parameters for wool characteristics in fine-wool Merino, Corriedale, and Polwarth sheep. I. Influence of various factors on production

1969 ◽  
Vol 20 (6) ◽  
pp. 1161 ◽  
Author(s):  
PD Mullaney ◽  
GH Brown ◽  
SSY Young ◽  
PG Hyland
Keyword(s):  
Reproductive Performance ◽  
Performance Data ◽  
Reproductive Status ◽  
Wool Production ◽  
Wool Quality ◽  
Effect Of Age ◽  
Age Structures

Estimates are given of the change in the level of production of 10 fleece characteristics of four Merino, one Polwarth, and three Corriedale flocks, in Victoria associated with variation in property, breed, season, property x season, age, and reproductive status. There was a decrease with age of characteristics associated with wool weight, and a decline in general wool quality. The decline was approximately linear for most characteristics from ewes of 3 years of age. Lactation was generally more severe than pregnancy in reducing wool production. The estimates of the effect of age on wool characteristics are used to assess the likely quantity and quality of wool produced by flocks of different age structures. These estimates may be used in conjunction with reproductive performance data to plan for maximum wool production.

Comparison of grazing oats and pasture for sheep production

1974 ◽  
Vol 14 (68) ◽  
pp. 322 ◽  
Author(s):  
PR Dann ◽  
A Axelsen ◽  
PM Bremner
Keyword(s):  
Reproductive Performance ◽  
Subterranean Clover ◽  
Annual Grass ◽  
Wool Production ◽  
Weight Gains ◽  
Sheep Production

In 1970 and 1971, the performance of ewes grazing oats at various stocking intensities during the final stages of pregnancy was compared with that of ewes, at stocking intensities considered optimal, on subterranean clover-annual grass pasture. Grazing oats produced no more winter feed than pasture in 1970, though quality of the oat herbage was better. In 1971, oats produced more, and better quality, herbage than pasture. Much greater ewe weight gains per head and per hectare were obtained on oats than on pasture in both years. In 1971, for example, ewes rotationally grazed on oats at 37 ha-1 gained 8 times more per head, and 23 times more per hectare, than ewes at 12 ha-1 on pasture. However, gains in reproductive performance and wool production were small or negligible.

Effects of defaunation of the rumen and supplementation with amino acids on the wool production of housed Saxon Merinos. 1. Lupins and extruded lupins

1988 ◽  
Vol 28 (2) ◽  
pp. 173 ◽  
Author(s):  
DJ Cottle
Keyword(s):  
Amino Acids ◽  
Wheat Straw ◽  
Sulfur Content ◽  
Growth Rates ◽  
Trial Period ◽  
Wool Production ◽  
Lower Resistance ◽  
Wool Growth ◽  
Wool Quality

Six groups, each comprising 10 superfine Merino wethers ('Sharlea'), were individually penned indoors and hand-fed oats and wheat straw, either alone or with 10% (w/w) crushed lupins or extruded lupins. The rations were fed at maintenance level and were offered 3 times a week. Half of the sheep were defaunated by drenching with Alkanate 3SL3. Wool growth rates and wool quality were measured during a 5-month trial period. Defaunation resulted in a 6.5% increase in clean wool production, with a 3% higher sulfur content. The quality of the wool grown was unaffected by defaunation. Inclusion of lupins or extruded lupins in the ration resulted in a 10% increase in clean wool growth. Wool quality was largely unaffected, though a lower resistance to compression was apparent. It was concluded that a reasonable diet for 'Sharlea' production was 500g oats, 50g wheat straw, 50g lupins, 10.5g vitamin, mineral mix per sheep per day. This diet may be further improved by additional ingredients and defaunation of the sheep.

The influence of vaccination with Fecundin and supplementation with lupin grain on the reproductive performance of Merino ewes in Western Australia

1990 ◽  
Vol 30 (4) ◽  
pp. 469
Author(s):  
KP Croker ◽  
MA Johns ◽  
SH Bell ◽  
GA Brown ◽  
JF Wallace
Keyword(s):  
Western Australia ◽  
Reproductive Performance ◽  
Average Rate ◽  
Multiple Pregnancies ◽  
Wool Production ◽  
Rate Of Growth ◽  
Nutritional Conditions ◽  
Average Quantity

The reproductive performances of groups of 4-6-year-old medium wool Merino ewes that were vaccinated with Fecundin and/or fed sweet lupin grain prior to and during the early part of the joining period were compared with untreated ewes over 2 years. The rams were joined with the ewes in early January of each year. In both years the Fecundin and lupin treatments increased ovulation rates (between 0.13 and 0.56) and the incidence of multiple pregnancies (between 1 and 36%). The proportions of lambs born following treatment with Fecundin were larger than those from the ewes fed only lupins. When the treatments were combined, there were no increases in lambs born above that of Fecundin alone. Pregnancy significantly depressed wool production from individual ewes, while those with more than 1 lamb produced less wool than those with only 1 lamb. However, the average quantity (4.6 kg greasy) and quality of wool produced by the ewes each year was similar for all groups, indicating that the variation in the incidence of multiple pregnancies had not affected flock wool production. The average rate of growth of the progeny from marking to weaning was also similar for each group (191 and 238 g/head.day for years 1 and 2, respectively) even though there were more multiple-born lambs in the Fecundin-treated groups. On a flock basis, it would appear that the nutritional conditions experienced during this study were adequate to avoid significant penalties associated with multiple pregnancies.

Some components of reproductive performance of sheep in Victoria

1970 ◽  
Vol 21 (6) ◽  
pp. 945 ◽  
Author(s):  
PD Mullaney ◽  
GH Brown
Keyword(s):  
Reproductive Performance ◽  
Relative Number ◽  
Relative Contribution ◽  
Effect Of Age ◽  
Age Estimates ◽  
Age Structures

Estimates are given of the relative contribution of each component of reproductive performance - the relative number of ewes having no, one, or two lambs - in the effect of age on the number of lambs born per ewe joined for Merino and Corriedale sheep in Victoria. For Merinos, the proportion of ewes giving birth to more than one lamb increased by 0.05 from ages 3 to 6, followed by a decline of 0.02 at age 8. For Corriedales, this proportion increased by 0.06 from age 3 to age 6. The proportion of ewes having no lamb was greater at the maiden lambing (age 3, Merinos; age 2, Corriedales) than at any other age. Estimates of the effect of age on these components are used to assess the reproductive performance of flocks of different age structures.

The influence of rate of stocking and application of superphosphate on the production and quality of wool, and on the gross margin from wethers

1972 ◽  
Vol 12 (57) ◽  
pp. 348 ◽  
Author(s):  
DJ Cannon
Keyword(s):  
Economic Advantage ◽  
Cost Structure ◽  
Entire Period ◽  
Quality Traits ◽  
Gross Margin ◽  
Wool Production ◽  
Wool Quality ◽  
The Given ◽  
Do So

From 1964-1969 wool production, liveweight, and wool quality traits were measured on Merino wethers stocked at rates ranging from 2 per acre (4.9 ha-1) to 8 per acre (19.8 ha-1) on plots receiving 50, 150 and 250 lb an acre (56, 168, and 280 kg ha-1) superphosphate annually. The effects of increases in the rate of stocking and the amount of superphosphate applied, on wool quality traits and gross margin returns during the entire period and on wool production from 1967 to 1969 are reported. In each year (1967 to 1969) wool production responded to an increase in superphosphate application from 50 to 150 lb but not to an increase from 150 to 250 lb. The response was substantial only in 1968. All wool traits were affected by the level of superphosphate in one or more years. In terms of gross margin returns ($/acre) it was profitable to apply more than 50 lb an acre of superphosphate in 1966 only. In 1969 it was clearly unprofitable to do so, and in 1965, 1967, and 1968 there was no economic advantage to any particular level of superphosphate application within the given cost structure.

scholarly journals Meat, wool and milk utilization together with comparison of F1 coming from Finnsheep rams with F1 coming from other prolific breeds

1988 ◽  
Vol 60 (6) ◽  
pp. 534-537
Author(s):  
R. Niznikowski ◽  
Z. J. Tyszka ◽  
W. Janikowski
Keyword(s):  
Milk Production ◽  
Reproductive Performance ◽  
Small Decrease ◽  
Ram Lambs ◽  
Wool Quality ◽  
High Level

The effect of crossing of Polish Corriedale (C) sheep with East Friesian, Finnsheep (F), and Polish Heath sheep was analyzed. The utility of F1 crossbreds coming from C and prolific breed rams (given above) was confirmed. The F, crosses of C ewes and F rams were characterized by the best reproductive performance, high level of milk production and the small decrease of wool quality and quantity produced by the ewes, and good carcase quality of ram lambs.

128 Differences in PRRSV Resilience for Reproductive Performance Between Landrace and Duroc Sows

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 18-19
Author(s):  
Felipe Hickmann ◽  
José Braccini Neto ◽  
Luke M Kramer ◽  
Kent A Gray ◽  
Yijian Huang ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Mixed Model ◽  
Performance Data ◽  
The Other ◽  
Wild Type ◽  
Prrs Virus ◽  
The Difference ◽  
The Impact

Abstract Studies on differences in resilience to porcine reproductive and respiratory syndrome (PRRS) virus (PRRSV) between breeds are scarce in the literature. Thus, the objective of this work was to assess PRRSV resilience in PRRSV wild-type infected sows from two breeds. Farrowing data included 2546 and 2522 litters from 894 Duroc and 813 Landrace sows, respectively, which were housed together and experienced the same PRRSV outbreak. Traits used for this study were number of piglets born alive (NBA), number born dead (NBD), total number born (TNB), and number weaned (NW). The impact of PRRSV infection was evaluated by comparing the reproductive performance of breeds between PRRS phases (pre-PRRS, PRRS, and post-PRRS). PRRS phases were defined based on the reproductive performance data. NBA, NBD, and NW were analyzed as a proportion of TNB using a Poisson mixed model. Pre-defined contrasts were used to evaluate the effect of breed on PRRSV resilience and on return to PRRSV-free performance, representing the differences between breeds for the difference between pre-PRRS and PRRS phases, and pre-PRRS and post-PRRS phases, respectively. There was a significant (P ≤ 0.003) interaction between PRRS phase and breed for all traits, as shown in Table 1. In general, reproductive performance reduced from pre-PRRS to PRRS, and then increased from PRRS to post-PRRS, as expected. The resilience contrast was significant for all traits (P ≤ 0.003). In all cases, the drop in percent reproductive performance from pre-PRRS to PRRS was lower for Duroc than for Landrace, indicating that Duroc sows have greater PRRSV resilience than Landrace sows. The return to PRRSV-free performance contrast had a trending effect for NBD (P = 0.055), and it was not significant for the other traits (P ≥ 0.515). These results indicate that Duroc sows have overall greater phenotypic PRRSV resilience for reproductive performance than Landrace sows.

The effects of nutrition on reproductive performance, lactation and carcass quality of once bred gilts

1995 ◽  
Vol 1995 ◽  
pp. 178-178
Author(s):  
A H Stewart ◽  
S A Edwards ◽  
V R Fowler
Keyword(s):  
Sugar Beet ◽  
Reproductive Performance ◽  
Feed Efficiency ◽  
Reproductive Physiology ◽  
Sugar Beet Pulp ◽  
Energy Sources ◽  
Carcass Quality ◽  
Beet Pulp ◽  
Ad Libitum

The once bred gilt system of production has a number of benefits in terms of feed efficiency and welfare, however the system relies on the production of a quality carcass and acceptable reproductive performance. Previous studies have indicated that welfare might be improved if gilts were ad-libitum fed a diet containing 60% Sugar beet pulp (Stewart et al 1993). There was a suggestion however that reproductive physiology may be put at risk using such a diet. The objective of this experiment was to identify differences in reproductive performance using two different energy sources in gestation and to manipulate nutrition during lactation to study the effect on carcass quality.

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