• TABLE OF CONTENTS
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 Experimental design
 Results and discussion
 Summary
 Table 1 - Ewe productivity
 Table 2 - Ewe weights
 Table 3 - Ewe hemoglobin levels...
 Table 4 - Lamb performance and...














Group Title: Department of Animal Science research report - Florida Agricultural Experiment Station ; AL-1980-2
Title: Productivity of Florida native ewes of the AA, BB and AB hemoglobin types
CITATION PAGE IMAGE ZOOMABLE
Full Citation
STANDARD VIEW MARC VIEW
Permanent Link: http://ufdc.ufl.edu/UF00073111/00001
 Material Information
Title: Productivity of Florida native ewes of the AA, BB and AB hemoglobin types
Series Title: Department of Animal Science research report
Physical Description: 2, 1 p. : ; 28 cm.
Language: English
Creator: Olson, T. A ( Timothy A )
Loggins, P. E., 1921-
University of Florida -- Dept. of Animal Science
University of Florida -- Agricultural Experiment Station
Publisher: Florida Agricultural Experiment Station
Place of Publication: Gainesville Fla
Publication Date: 1980
 Subjects
Subject: Sheep breeds -- Florida   ( lcsh )
Ewes -- Breeding -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: T.A. Olson and P.E. Loggins.
General Note: Caption title.
General Note: "May, 1980."
Funding: Animal science research report (University of Florida. Dept. of Animal Science) ;
 Record Information
Bibliographic ID: UF00073111
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 80733774

Table of Contents
    Experimental design
        Page 1
    Results and discussion
        Page 1
    Summary
        Page 2
    Table 1 - Ewe productivity
        Page 3
    Table 2 - Ewe weights
        Page 3
    Table 3 - Ewe hemoglobin levels (gms/100 ml)
        Page 3
    Table 4 - Lamb performance and hemoglobin levels
        Page 3
Full Text




Department of Animal Science Florida Agricultural
Research Report AL-1980-2 Experiment Station
May, 1980 Gainesville, Florida
PRODUCTIVITY OF FLORIDA NATIVE EWES OF THE
AA, BB AND AB HEMOGLOBIN TYPES

T.A. Olson and P.E. Loggins


The Florida Native sheep are descendants of sheep of mixed breeding that
were developed largely through natural selection under native range conditions
in Florida; their physical characteristics include a small mature weight, re-
fined bone structure, an open face and clean legs and underline. These sheep
have developed a degree of resistance to internal parasites; the flock from
which these data were collected having been maintained without the use of
anthelmintics since 1962. The objective of this report is to examine measures
of productivity of Florida Native ewes of three hemoglobin types.

Experimental Design

The Florida Native sheep included in this study descended from a foun-
dation purchased from four locations in Florida in 1956. The ewes were
divided into breeding groups based on hemoglobin type and bred to rams of the
same hemoglobin type. They were maintained as a single flock except during the
forty day breeding season which began July 1. The data collected on the ewes
included pregnancy rate, numbers of lambs born, weight at the beginning of the
breeding season (August), prior to lambing (November), and after weaning of
their lambs (February). Hemoglobin levels (gms/100 ml) were eval-
uated at the same times as weights were recorded. Birth and weaning (60 day)
weights as well as weights at approximately 120 days, survival rate and hemoglobin
levels at weaning were recorded on the progeny of ewes of each hemoglobin type.

The data collected on ewes were analyzed by least squares procedures using
models that included the main effects of year, hemoglobin type, ewe age, and
interactions with F values over 1. The models used in analysis of lamb data
included the effects used in the ewe analyses plus sex, birth type (single or
twin) and interactions of importance.
Results and Discussion

Data from 568 records of ewes exposed to breeding and 500 lambs produced
from 1978 to 1977 were used in this study. Table 1 contains the least squares
means of data relating to ewe productivity. Type BB ewes had a higher (P<.02)
pregnancy rate than type AA and surpassed (P<.01) type AB but not type AA
(P<.05) in lamb survival rate. Numbers of ewes producing twins did not sign-
ificantly vary between groups. By combining pregnancy percentage, number of
lambs born per ewe and ewe survival into a single value, lambs weaned per 100
ewes bred can be estimated. This value cannot be analyzed statistically but
BB ewes (94) far surpassed either AA (79) or AB (75) ewes.








Department of Animal Science Florida Agricultural
Research Report AL-1980-2 Experiment Station
May, 1980 Gainesville, Florida
PRODUCTIVITY OF FLORIDA NATIVE EWES OF THE
AA, BB AND AB HEMOGLOBIN TYPES

T.A. Olson and P.E. Loggins


The Florida Native sheep are descendants of sheep of mixed breeding that
were developed largely through natural selection under native range conditions
in Florida; their physical characteristics include a small mature weight, re-
fined bone structure, an open face and clean legs and underline. These sheep
have developed a degree of resistance to internal parasites; the flock from
which these data were collected having been maintained without the use of
anthelmintics since 1962. The objective of this report is to examine measures
of productivity of Florida Native ewes of three hemoglobin types.

Experimental Design

The Florida Native sheep included in this study descended from a foun-
dation purchased from four locations in Florida in 1956. The ewes were
divided into breeding groups based on hemoglobin type and bred to rams of the
same hemoglobin type. They were maintained as a single flock except during the
forty day breeding season which began July 1. The data collected on the ewes
included pregnancy rate, numbers of lambs born, weight at the beginning of the
breeding season (August), prior to lambing (November), and after weaning of
their lambs (February). Hemoglobin levels (gms/100 ml) were eval-
uated at the same times as weights were recorded. Birth and weaning (60 day)
weights as well as weights at approximately 120 days, survival rate and hemoglobin
levels at weaning were recorded on the progeny of ewes of each hemoglobin type.

The data collected on ewes were analyzed by least squares procedures using
models that included the main effects of year, hemoglobin type, ewe age, and
interactions with F values over 1. The models used in analysis of lamb data
included the effects used in the ewe analyses plus sex, birth type (single or
twin) and interactions of importance.
Results and Discussion

Data from 568 records of ewes exposed to breeding and 500 lambs produced
from 1978 to 1977 were used in this study. Table 1 contains the least squares
means of data relating to ewe productivity. Type BB ewes had a higher (P<.02)
pregnancy rate than type AA and surpassed (P<.01) type AB but not type AA
(P<.05) in lamb survival rate. Numbers of ewes producing twins did not sign-
ificantly vary between groups. By combining pregnancy percentage, number of
lambs born per ewe and ewe survival into a single value, lambs weaned per 100
ewes bred can be estimated. This value cannot be analyzed statistically but
BB ewes (94) far surpassed either AA (79) or AB (75) ewes.








Ewe weights and hemoglobin levels (gms/100 ml) by hemoglobin type at the
initiation of the breeding season (August), prior to lambing (November), and
at the weaning of their lambs (February) are shown in tables 2 and 3. Type
BB ewes were consistently the lightest and Type AA ewes the heaviest, but only
in November was the difference significant at the .05 level. Ewes of Type
AB were always intermediate in weight between types AA and BB but never did
they differ significantly from either type AA or BB.

Ewe hemoglobin levels, however, were always very highly significantly
(P<.001) different regardless of the month of measurement (Table 3). Type AA
ewes were always heaviest, type BB ewes lightest and type AB ewes intermediate
between them. The hemoglobin types thus rank in the same order for hemoglobin
level as they do for weight. This ranking, however, is the reverse of the
ranking observed for pregnancy rate. This occurred in spite of the fact that
ewes which became pregnant were highly significantly heavier (P .002) than
ewes which failed to conceive (40.3 vs. 38.6 kgs). The ewes becoming pregnant
also had highly significantly (P<.OOT1 higher hemoglobin levels during the
breeding season than the ewes which were infertile (7.01 vs. 6.15 gms/100 ml).
Thus it appears clear that in general the ewes with higher hemoglobin levels are
more fertile, in contrast to the situation with regard to hemoglobin type where
the type with the lowest hemoglobin levels (type BB) was the most fertile. An
explanation for these conflicting results is not readily apparent.

Differences in lamb performance due to ewe hemoglobin type were not
striking (Table 4.) The lambs from AB ewes were heavier at birth (P<.05) than
those from either AA or BB ewes, but no significant differences were present at
weaning. Lambs from AA ewes gained slower (P<.05) than those from BB or AB
ewes. The lowered growth rate of the lambs from AA ewes did not appear to
be the result of greater parasitism as they has the highest (P<.001) hemoglobin
levels. Again the paradoxical situation is seen in that the lambs of the
hemoglobin type with the highest hemoglobin level show the lowest performance.

Summary

Ewes of Florida Native breeding of these hemoglobin types (AA, BB and
AB) were mated to rams of their hemoglobin type and their pregnancy rate,
rate of lamb production andlamb survival rate, birth weight, weaning weight
and postweaning average daily gain were recorded over a five year period.
Hemoglobin levels (gms/100 ml of blood) were also measured on the ewes at the
beginning of the breeding season, prior to lambing and at the weaning of their
lambs. Lamb hemoglobin levels were also measured at weaning. The type BB
ewes had the lowest hemoglobin levels but surpassed the AB and AA ewes in
pregnancy rate and lamb survival rate to weaning. There were only small
differences in lambs born per pregnant ewe and lamb growth traits. These
results indicate that hemoglobin type may have some value as an indicator
of fertility and survival and could, therefore, be useful as a selection tool
for these traits.





Table 1. Ewe productivity

e Bood Ty Pregnancy Number of Lamb Lambs Weaned
we Blood Type percentage Lambs Born/Ewe Survival Per 100 Ewes Bred

AA 75.03.3a 1.13.03a 93.22.0a,b 79

BB 86.04.0b 1.15.03a 95.82.0a 94

AB 80.03.2a, 1.07.03a 87.92.0b 75

'Means-with the same letter as a superscript do not differ significantly
at the .05 level.


Table 2. Ewe weights
Ewe Month
Hemogl-obin
Type August November February

AA 39.9.5a 41.9.6a 38.5.5a

BB 39.0.5a 40.0.5b 37.3.5a

AB 39.3.4a 41.0.4a'b 38.1.4a

abMeans with the same letter as a superscript do not
differ significantly at the .05 level.


Table 3. Ewe hemoglobin levels (gms/100


ml)


Ewe Hb Type August November February
Hb Level Hb Level Hb Level

AA 7.2.14a 7.8.17a 7.1.15a

BB 6.1.17b 6.9.21b 6.2.19b

AB 6.5.13c 7.4.16c 6.7.14c


a,',cMeans with
not differ


the same letters as superscripts do
significantly at the .05 level.


Table 4. Lamb performance and hemoglobin levels


Birth
Weight (kg)

3.3.04a

3.2.04a

3.4.09b


Lamb Hb Level
:at Weaning
(gms/100 ml)

10.3.13a

8.8.13b

9.4.13c


Post Wean
Average Daily
Gain (kg/day)

.136.004a

.147.004b

.147.004b


150 Day
Weight (kg)

20.5.38a

21.3.38ab

21.7.37b


Weaning
Weight (kg)

12.3+.24a

12.5+.23a

12.9.23a


CMeans with the same letters as superscripts do not differ significantly at the .05 level.


Hb Type

AA

BB

AB


--





Table 1. Ewe productivity

e Bood Ty Pregnancy Number of Lamb Lambs Weaned
we Blood Type percentage Lambs Born/Ewe Survival Per 100 Ewes Bred

AA 75.03.3a 1.13.03a 93.22.0a,b 79

BB 86.04.0b 1.15.03a 95.82.0a 94

AB 80.03.2a, 1.07.03a 87.92.0b 75

'Means-with the same letter as a superscript do not differ significantly
at the .05 level.


Table 2. Ewe weights
Ewe Month
Hemogl-obin
Type August November February

AA 39.9.5a 41.9.6a 38.5.5a

BB 39.0.5a 40.0.5b 37.3.5a

AB 39.3.4a 41.0.4a'b 38.1.4a

abMeans with the same letter as a superscript do not
differ significantly at the .05 level.


Table 3. Ewe hemoglobin levels (gms/100


ml)


Ewe Hb Type August November February
Hb Level Hb Level Hb Level

AA 7.2.14a 7.8.17a 7.1.15a

BB 6.1.17b 6.9.21b 6.2.19b

AB 6.5.13c 7.4.16c 6.7.14c


a,',cMeans with
not differ


the same letters as superscripts do
significantly at the .05 level.


Table 4. Lamb performance and hemoglobin levels


Birth
Weight (kg)

3.3.04a

3.2.04a

3.4.09b


Lamb Hb Level
:at Weaning
(gms/100 ml)

10.3.13a

8.8.13b

9.4.13c


Post Wean
Average Daily
Gain (kg/day)

.136.004a

.147.004b

.147.004b


150 Day
Weight (kg)

20.5.38a

21.3.38ab

21.7.37b


Weaning
Weight (kg)

12.3+.24a

12.5+.23a

12.9.23a


CMeans with the same letters as superscripts do not differ significantly at the .05 level.


Hb Type

AA

BB

AB


--





Table 1. Ewe productivity

e Bood Ty Pregnancy Number of Lamb Lambs Weaned
we Blood Type percentage Lambs Born/Ewe Survival Per 100 Ewes Bred

AA 75.03.3a 1.13.03a 93.22.0a,b 79

BB 86.04.0b 1.15.03a 95.82.0a 94

AB 80.03.2a, 1.07.03a 87.92.0b 75

'Means-with the same letter as a superscript do not differ significantly
at the .05 level.


Table 2. Ewe weights
Ewe Month
Hemogl-obin
Type August November February

AA 39.9.5a 41.9.6a 38.5.5a

BB 39.0.5a 40.0.5b 37.3.5a

AB 39.3.4a 41.0.4a'b 38.1.4a

abMeans with the same letter as a superscript do not
differ significantly at the .05 level.


Table 3. Ewe hemoglobin levels (gms/100


ml)


Ewe Hb Type August November February
Hb Level Hb Level Hb Level

AA 7.2.14a 7.8.17a 7.1.15a

BB 6.1.17b 6.9.21b 6.2.19b

AB 6.5.13c 7.4.16c 6.7.14c


a,',cMeans with
not differ


the same letters as superscripts do
significantly at the .05 level.


Table 4. Lamb performance and hemoglobin levels


Birth
Weight (kg)

3.3.04a

3.2.04a

3.4.09b


Lamb Hb Level
:at Weaning
(gms/100 ml)

10.3.13a

8.8.13b

9.4.13c


Post Wean
Average Daily
Gain (kg/day)

.136.004a

.147.004b

.147.004b


150 Day
Weight (kg)

20.5.38a

21.3.38ab

21.7.37b


Weaning
Weight (kg)

12.3+.24a

12.5+.23a

12.9.23a


CMeans with the same letters as superscripts do not differ significantly at the .05 level.


Hb Type

AA

BB

AB


--





Table 1. Ewe productivity

e Bood Ty Pregnancy Number of Lamb Lambs Weaned
we Blood Type percentage Lambs Born/Ewe Survival Per 100 Ewes Bred

AA 75.03.3a 1.13.03a 93.22.0a,b 79

BB 86.04.0b 1.15.03a 95.82.0a 94

AB 80.03.2a, 1.07.03a 87.92.0b 75

'Means-with the same letter as a superscript do not differ significantly
at the .05 level.


Table 2. Ewe weights
Ewe Month
Hemogl-obin
Type August November February

AA 39.9.5a 41.9.6a 38.5.5a

BB 39.0.5a 40.0.5b 37.3.5a

AB 39.3.4a 41.0.4a'b 38.1.4a

abMeans with the same letter as a superscript do not
differ significantly at the .05 level.


Table 3. Ewe hemoglobin levels (gms/100


ml)


Ewe Hb Type August November February
Hb Level Hb Level Hb Level

AA 7.2.14a 7.8.17a 7.1.15a

BB 6.1.17b 6.9.21b 6.2.19b

AB 6.5.13c 7.4.16c 6.7.14c


a,',cMeans with
not differ


the same letters as superscripts do
significantly at the .05 level.


Table 4. Lamb performance and hemoglobin levels


Birth
Weight (kg)

3.3.04a

3.2.04a

3.4.09b


Lamb Hb Level
:at Weaning
(gms/100 ml)

10.3.13a

8.8.13b

9.4.13c


Post Wean
Average Daily
Gain (kg/day)

.136.004a

.147.004b

.147.004b


150 Day
Weight (kg)

20.5.38a

21.3.38ab

21.7.37b


Weaning
Weight (kg)

12.3+.24a

12.5+.23a

12.9.23a


CMeans with the same letters as superscripts do not differ significantly at the .05 level.


Hb Type

AA

BB

AB


--




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