The effect of age and diet on the reproductive performance of Sudan Nilotic ewes

2005 ◽  
Vol 143 (5) ◽  
pp. 421-426 ◽  
Author(s):  
M. ATTA ◽  
O. A. EL KHIDIR
Keyword(s):  
Reproductive Performance ◽  
Research Centre ◽  
Southern Sudan ◽  
Oil Cakes ◽  
Body Weights ◽  
Sorghum Grains ◽  
Mortality Proportion ◽  
Production Research ◽  
Similar Body ◽  
Effect Of Age

Two flocks of 42 multiparous (M) and 27 primiparous (P) Nilotic ewes (Southern Sudan) were used in an experiment conducted at the Animal Production Research Centre, Khartoum N., Sudan, to study the effect of age and diet on reproductive performance. Each age group (M and P) was subdivided into two diet groups, fed either a sorghum (So) or a molasses (Mo)-based diet. The two diets were approximately isoenergetic (12·2 and 11·4 MJ ME/kg DM for So and Mo diets, respectively) and isonitrogenous (217 g CP/kg). These diets were formulated from sorghum and groundnut cake or molasses and urea as main sources of energy and protein, respectively. Each of the four diet groups of ewes was further divided into 6 subgroups (replicates) of similar body weights housed and fed together for two successive gestation periods. The results showed that the diet treatments had no significant effect on age and weights at first oestrous (210, 238 days and 22, 20 kg) and at first lambing (407, 418 days and 30, 28 kg) of the PSo and PMo groups, respectively. Age of the ewes and the diet treatments had no significant effects (P>0·05) on feed intake, conception weight, litter size, lamb birth weight, gestation period, postpartum anoestrous period, lambing interval, sex ratio of offspring as well as conception, fertility, abortion and lambing proportions. Primiparous ewes (P) had significantly (P<0·05) higher pre-weaning lamb mortality proportion, whereas the sorghum-based diet groups had higher (P<0·05) gestation body gain and lambing weights.It was concluded that Nilotic ewes, compared with the other African sheep breeds reviewed, reach sexual maturity at an earlier age and are highly prolific due to their short postpartum anoestrous period. The results also highlight the importance of molasses and urea as efficient and good substitutes for sorghum grains and oil cakes, respectively, in the diets of ewes.

Laying performance of six pure lines of chickens and four commercial hybrids at the Agassiz Research Centre

2010 ◽  
Vol 90 (3) ◽  
pp. 341-347 ◽  
Author(s):  
F G Silversides
Keyword(s):  
Egg Production ◽  
Pure Line ◽  
Feed Consumption ◽  
Research Centre ◽  
Laying Performance ◽  
Body Weights ◽  
Production Body ◽  
The Difference ◽  
Pure Lines ◽  
Similar Body

The Agassiz Research Centre keeps six pure lines of high-producing but non-commercial layers. Egg production, body weight, feed consumption and efficiency, and several characteristics of the eggs were measured to 60 wk of age and compared with those of four commercial white- and brown-egg hybrids. Egg production from 20 to 60 wk was highest for the four commercial hybrids, with no difference between them, and was 6 to 11% lower for the pure line white-egg layers, and 7 to 13% lower for the pure line brown-egg layers. The pure line and hybrid white-egg layers had similar body weights, but the pure line brown-egg layers weighed more than the commercial brown-egg hybrid. Feed efficiency was similar for the four hybrids and was generally better for the hybrids than the pure lines, based largely on higher egg production rather than increased feed consumption. The difference between industrial hybrids and the pure lines studied can be attributed to the selection that has been applied as well as to heterosis. Key words: Chicken, genetic resources, Agassiz layer lines

Shooting and Rooting Behaviour in Relation to Season, Age and Growing Conditions of Dendrocalamus asper Backer

2020 ◽  
Vol 27 (1) ◽  
pp. 56-60
Author(s):  
Reena Joshi ◽  
Salil Tewari ◽  
Rajesh Kaushal
Keyword(s):  
Summer Monsoon ◽  
Block Design ◽  
Research Centre ◽  
Agroforestry Research ◽  
Randomized Block Design ◽  
Different Seasons ◽  
Dendrocalamus Asper ◽  
Growing Conditions ◽  
One Year ◽  
Effect Of Age

The experiment was conducted at Agroforestry Research Centre, of G. B. Pant University of Agriculture and Technology, Pantnagar to assess the effect of age (one and two year old), growing condition (intermittent misting and no misting) and different seasons (summer, monsoon, autumn and spring) on rooting and shooting of culm cuttings of Dendrocalamus asper. The experiment was laid out in factorial randomized block design with three replications. The findings indicated that in D. asper, one year old culm cuttings in the intermittent misting condition showed good results. The findings also indicated that shooting and rooting per cent of culm cuttings planted in different season showed response as Spring (March)> Summer (June)> Monsoon (August)> Autumn (October).

Cumulative reproductive performance effect on overall lifetime productivity in Merino sheep

2018 ◽  
Vol 58 (8) ◽  
pp. 1470
Author(s):  
J. S. Richards ◽  
M. A. Sladek ◽  
G. J. Lee
Keyword(s):  
Reproductive Performance ◽  
New South ◽  
Dental Health ◽  
Age Groups ◽  
The South ◽  
Performance Effect ◽  
South West ◽  
South Wales ◽  
The Impact ◽  
Effect Of Age

Reproduction is an important driver of profitability in commercial sheep flocks. Historically, Merino flocks have been run with a fixed age structure, ignoring individual merit and casting for age at a specific age. More recently, research has focussed on utilising the variation within age groups by keeping productive older ewes longer and culling less productive ewes earlier. Previous studies have also examined the effect of age on reproduction and the impact of reproduction status on productivity, but little research has been conducted on cumulative effects of reproductive performance on later productivity, reproduction and health. The present study examined the impact of higher lifetime reproduction on other key production and fitness traits in older ewes run under commercial conditions. Data were collected from two commercial wool-producing properties in the South West Slopes and the Central West Plains of New South Wales during 2009–2011. Reproduction, fleece measurements, bodyweight and condition and dental health were recorded during the study. The results showed that age had a bigger effect on productivity and dental health than did cumulative lifetime reproduction. Environment and genetics determined the level of impact, with minimal loss in productivity from increased age of animals occurring in the South West Slopes flock, whereas the Central West Plains flock would appear to require closer monitoring of productivity as ewes aged. The data collected did not allow separation of the genetic and environmental influences within the study. Retaining animals with a higher reproductive performance past normal culling age does not necessarily result in reduction of productivity or ewe health, but this must be monitored.

scholarly journals Effect of age and backfat thickness on reproductive performance of 100 kg Large White sows

1985 ◽  
Vol 34 (3) ◽  
pp. 365-365
Author(s):  
R. GUEBLEZ ◽  
J. M. GESTIN ◽  
Geneviève LE HENAFF
Keyword(s):  
Reproductive Performance ◽  
Backfat Thickness ◽  
Large White ◽  
Effect Of Age

scholarly journals Reproductive Performance and Body Weights of Mice Maintained for 12 Generations at 34°C

1969 ◽  
Vol 22 (3) ◽  
pp. 667 ◽  
Author(s):  
Pamela R Pennycuik
Keyword(s):  
Reproductive Performance ◽  
Body Weights

The reproductive performance and body weights of mice exposed to 34�C for 12 generations were compared with those of mice maintained at 21�C over the same period.

Effects of selection for production and maternal diet on maiden dairy heifer fertility

2002 ◽  
Vol 74 (3) ◽  
pp. 415-421 ◽  
Author(s):  
J. E. Pryce ◽  
G. Simm ◽  
J. J. Robinson
Keyword(s):  
Reproductive Performance ◽  
Maternal Nutrition ◽  
Maternal Diet ◽  
Limited Range ◽  
Research Centre ◽  
Selection Line ◽  
Control Line ◽  
Maternal Environment ◽  
Significant Relationships ◽  
The Uk

AbstractThe objectives of this study were to investigate reproductive performance and the influence of maternal environment on reproductive performance in two genetic lines of maiden heifers. These were given food and managed in the same way at the Langhill Dairy Cattle Research Centre. The two genetic lines were established in 1973; one has been selected for high combined yield of fat plus protein (selection line; S) and the other has been maintained at around the UK average for genetic merit of yield of fat plus protein (control line; C). Analysis of the reproductive performance of 988 heifers born between 1981 and 1998 showed that S heifers were poorer (all P < 0·05) than C heifers for all reproductive measures: conception at first service (S: 0·64, s.e. 0·02; C: 0·71, s.e. 0·03), interval between first and last service (S: 18·2 days, s.e. 2·2; C: 13·4 days, s.e. 2·2) and number of services per conception (S: 1·49 services, s.e. 0·06; C: 1·39 services, s.e. 0·06). S heifers were also younger at first service than C heifers (474·9 days v. 480·1 days, s.e. 1·9, for S and C respectively; P • 01). Fertility of service sires may have had some influence on these results, but this could not be investigated here, as S heifers were mated only to high merit bulls and C heifers to average merit bulls. However, within genetic line, the yearly downward trend in the average number of services per conception of heifers was significantly different from zero for the S line, but not the C line. There were no statistically significant relationships between conception rates in maiden heifers and their subsequent reproductive performance in first lactation. The effect of maternal environment on the reproductive performance of daughters as maiden heifers was investigated. There were no statistically significant relationships between daughter reproductive performance and dam parity or the feeding system of the dam (either a high or low level of concentrates). Within the limited range of nutritional status of dams during the periods post calving and in early pregnancy, there was no statistically significant effect of maternal nutrition on daughter reproductive performance.

Effect of age at weaning on the subsequent growth of artificially reared lambs

1974 ◽  
Vol 14 (71) ◽  
pp. 720
Author(s):  
JA Levick ◽  
GR Pearce
Keyword(s):  
Liquid Diet ◽  
The Body ◽  
Subsequent Growth ◽  
Body Weights ◽  
Effect Of Age

Lambs were removed from their dams at 0, 1, 3 and 7 days of age and reared artificially on a liquid diet. Lambs weaned at 7 days suffered a more prolonged check to growth than other lambs but the body weights of all lambs were similar at 28 days of age. Lambs weaned at 7 days required considerably more handling before they would drink voluntarily from rubber teats.

The association between face cover and the productivity of Merino ewes in twelve NSW flocks

1967 ◽  
Vol 7 (28) ◽  
pp. 412
Author(s):  
JP Drinan ◽  
RB Dun
Keyword(s):  
Reproductive Performance ◽  
New South ◽  
New South Wales ◽  
Negative Association ◽  
The Body ◽  
Positive Correlation ◽  
South Wales ◽  
Body Weights ◽  
The Face ◽  
Fleece Weight

The association between the face cover and productivity of more than 3000 Merino ewes has been examined in 12 flocks located in the major sheep producing areas of New South Wales. Each flock was divided into Open (scores 1 and 2), Moderate (scores 3 and 4), and Muffled (scores 5 and 6) groups. A significant negative association between face cover and reproductive performance was apparent in two flocks that contained appreciable numbers of muffled-faced ewes. A similar trend was apparent in another Muffled flock, but in one other Muffled flock and four Open flocks, there was no evidence of such an association. The results from the remaining four flocks were not considered, due to the possibility that the results were confounded by face cover scoring after joining. In one Muffled flock, the body weights of weaner lambs were negatively correlated with their dams' face cover. A relationship between face cover score and total greasy fleece weight, corrected for previous reproductive performance, was absent from most flocks and negative in two, despite evidence of a positive correlation with belly weight. There was a trend to inferior fleeces of finer trade count in Moderate and Muffled groups of several flocks. Excess face cover was found to be an undesirable attribute in Merino flocks. Its importance was greatest in flocks containing appreciable numbers of muffled-faced ewes

scholarly journals Effect of age at photostimulation on reproductive performance of Beijing-You Chicken breeders

2019 ◽  
Vol 98 (10) ◽  
pp. 4522-4529 ◽  
Author(s):  
Lei Shi ◽  
Yanyan Sun ◽  
Hong Xu ◽  
Yifan Liu ◽  
Yunlei Li ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Effect Of Age
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