Group Title: Animal husbandry and nutrition mimeograph series - UF Dept. of Animal Husbandry and Nutrition ; no. 59-10
Title: Effect of a protein deficiency on reproduction in beef cattle
CITATION THUMBNAILS PAGE IMAGE ZOOMABLE
Full Citation
STANDARD VIEW MARC VIEW
Permanent Link: http://ufdc.ufl.edu/UF00072884/00001
 Material Information
Title: Effect of a protein deficiency on reproduction in beef cattle
Series Title: Animal husbandry and nutrition mimeograph series
Physical Description: 4 leaves : ; 28 cm.
Language: English
Creator: Warnick, A. C ( Alvin C )
University of Florida -- Dept. of Animal Husbandry and Nutrition
Publisher: Florida Agricultural Experiment Station, Dept. of Animal Husbandry and Nutrition
Place of Publication: Gainesville Fla
Publication Date: 1959
 Subjects
Subject: Beef cattle -- Feeding and feeds -- Florida   ( lcsh )
Protein deficiency -- Florida   ( lcsh )
Proteins in animal nutrition   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: A.C. Warnick.
General Note: Caption title.
General Note: "April - 1959."
Funding: Animal husbandry & nutrition mimeograph series ;
 Record Information
Bibliographic ID: UF00072884
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 76966919

Full Text



Animal Husbandry and Nutrition
Mimeograph Series No. 59-10


Florida Agricultural
Experiment Station
Gainesville, Florida
April 1959


EFFECT OF A PROTEIN DEFICIENCY ON
REPRODUCTION IN BEEF CATTLE I

A. C. Warnick


Many pastures during the winter have a low protein content and cattle may
lose weight during this period. The objective of this report is to give data
to show the harmful effects of a protein deficiency on reproduction performance.


Table I. EFFECT OF PROTEIN INTAKE ON
GAINS AND REPRODUCTION OF HEIFERS
(5 British bred heifers per group)
Yearling Heifers (approximately 170 day period)
Daily Crude Average Average
Protein Intake Initial Wt Final Wt.


(Ibs.)


(Ibs.)


Average
Daily Gain
(Ibs.)


I 1.06 491 649 0.94
II 0.65 498 625 0.70
III 0.28 496 519 0.01
IV 0.08 499 383 0.72


Table 2. REPRODUCTION PERFORMANCE
OF
YEARLING HEIFERS ON ABOVE RATIONS
Group No. Days to No. Heat No. Active Number
First Heat Period Corpus luteum a Bred
I 50 19 5 5
II 76 13 3 5
III 90 12 2 2
IV 162 0 0 9

a. beginning of breeding season




Annual Beef Cattle Short Course, University of Florida, Gainesville,
April 16, 1959.


Group
No.










-2-


Table 3. CONCEPTION AND EMBRYONIC
DEVELOPMENT IN THESE YEARLING HEIFERS


Total No.
Breedings


Total Normal
Embryos
44 days Post-breeding


Total No.
Active
corpus luteum


Table 4. EFFECT OF PROTEIN SUPPLEMENT FEED ON PASTURE
DURING THE WINTER ON WEIGHT OF PA~'US
NONPREGNANT 3-YEAR-OLD COWS

No. Weight Weight Weight
Cows 10-29-53 3-2-54 6-5-54


I grass
II grass
III Clover-grass
IV Clover-grass


protein
Ibs. CSM
protein
Ibs. CSM


59)
577
581
656


Table 5. EFFECT OF PROTEIN SUPPLEMENTATION
ON REPRODUCTION OF ABOVE COWS b


% Pregnancy
and Calving


No. days from
Dec. I, 1954 to
Calvino


% Pregnant
Fall 1955


b96 day breeding season


Group


Group


1 _


__ 17 __
_1 __ _


~~_____~__~__ ___~_ __


_ _~____~_


-
- -~--


Group








-3-


Table 6. EFFECT OF PROTEIN INTAKE ON WEIGHTS OF
'' PREGNANT AND LACTATING BEEF COWS (6 cows


per subgroup)


Group


Age


No. Weight
Females 11-30-57


Weight
5-17-58


Daily
gains of
Calves


(Ibs) (Ibs) (Ibs)

I 100% protein 3 year old 6 823 781 1.21
requirements
Il 50% protein 3 year old 5 829 676 0.93
requirements
III 100% protein 8 year old 6 921 887 1.58
requirements
IV 50% protein 8 year old 6 928 737 1.27
requirements


Table 7. EFFECT OF PROTEIN INTAKE ON REPRODUCTION OF
LACTATING BEEF COWS ON ABOVE RATIONS


No. Days Calving
to Ist breeding


No. Pregnant


I (17)
0 (0 )
5 (83)
2 (33)


() = percent pregnant


CONCLUSIONS


Yearling heifers fed 0.28 lbs. of crude protein daily in dry lot
maintaining their weight did not reproduce normally. Some heifers on
tenance protein intake failed to show heat or ovulation and could not
while others were bred but did not become pregnant.


and just
the main-
be bred


Yearling heifers fed 0.08 lb. of crude protein daily and losing 0.72 Ib
daily per head did not show estrus and did not ovulate indicating inactive
ovaries.


Group


No. Bred








-4-


Three year old nonlactating cows grazing frosted grass pasture in th;
winter without a protein supplement lost 0.41 Ib. daily per head during four
winter months. During the breeding season they made good gains but heat and
breeding was delayed until near the end of the 96 day breeding season. Only
75% became pregnant compared to 100% in the cows receiving some proulci s,-
plement. Calving dates were 42 days later than the cows receiving a protein
supplement.

Three year old pregnant and lactating cows receiving approximately 50%
of their protein requirements lost 150 Ibs. in weight from late pregnancy to
end of the breeding season approximately four months after calving. Only 2
of 5 cows were bred but ovulation did not occur so there were no pregnancies.
Only 17% of the cows getting adequate protein were pregnant which was lower
than expected.

Mature 8 year old pregnant and lactating cows receiving approximately
50% of their protein requirements lost 191 lbs. in weight from late preg-
nancy to end of the breeding season approximately four months after calving.
Only 2 of 6 cows were bred and both became pregnant compared to 5 of 6 cows
being pregnant on the adequate ration. Cows on inadequate protein that did not
come into heat did not have a corpus luteum on the ovary.

A deficient protein intake under extreme conditions reduces appetite and
reduces reproductive performance. The low protein intakes reduce'; the mani-
festation of heat, the possibility of heat and ovulation in various ages of
breeding females.




















An Husb
400 copies
vh




University of Florida Home Page
© 2004 - 2010 University of Florida George A. Smathers Libraries.
All rights reserved.

Acceptable Use, Copyright, and Disclaimer Statement
Last updated October 10, 2010 - - mvs