Maternal performance for first calf production was evaluated in retrospect for daughters whose sires had expected progeny differences (EPDs) available from 1988 beef breed association national genetic evaluation summaries. When grouped into high EPD and low EPD groups, sire EPD group averages for actual daughter milk production and weaning weights of daughters\u27 off  spring consistently ranked the same as sire group average EPDs for milk and maternal weaning weight, although differences between groups were not statistically significant

Freking, B.A.

Marshall, D.M.

English

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South Dakota State UniversityOpen PRAIRIE: Open Public Research Access InstitutionalRepository and Information ExchangeSouth Dakota Beef Report, 1988 Animal Science Reports1988Relationship of Sire Expected Progeny Differencesto Maternal Performance of First-Calf Daughters ina Commercial HerdD.M. MarshallSouth Dakota State UniversityB.A. FrekingSouth Dakota State UniversityFollow this and additional works at: http://openprairie.sdstate.edu/sd_beefreport_1988Part of the Animal Sciences CommonsThis Report is brought to you for free and open access by the Animal Science Reports at Open PRAIRIE: Open Public Research Access InstitutionalRepository and Information Exchange. It has been accepted for inclusion in South Dakota Beef Report, 1988 by an authorized administrator of OpenPRAIRIE: Open Public Research Access Institutional Repository and Information Exchange. For more information, please contactmichael.biondo@sdstate.edu.Recommended CitationMarshall, D.M. and Freking, B.A., "Relationship of Sire Expected Progeny Differences to Maternal Performance of First-CalfDaughters in a Commercial Herd" (1988). South Dakota Beef Report, 1988. Paper 20.http://openprairie.sdstate.edu/sd_beefreport_1988/20RELATIONSHIP OF SIRE EXPECTED PROGENY DIFFERENCES TO MATERNAL PERFORMNCE OF FIRST-CALF DAUGHTERS I N  A CCWERCIAL HERD 1 2 D. M. Marshal l  and B. A. F rek ing Department o f  Animal and Range Sciences CATTLE 88-19 Maternal  performance f o r  f i r s t  c a l f  p roduct ion  was eva luated i n  re t rospec t  f o r  daughters whose s i r e s  had expected progeny d i f f e r e n c e s  (EPDs) a v a i l a b l e  from 1988 beef breed assoc ia t i on  n a t i o n a l  gene t i c  eva lua t i on  sumnaries. When grouped i n t o  h i g h  EPD and Low EPD groups, s i r e  EPD group averages f o r  ac tua l  daughter m i l k  p roduc t i on  and weaning weights o f  daughters '  o f f s p r i n g  c o n s i s t e n t l y  ranked t h e  same as s i r e  group average EPDs f o r  m i l k  and maternal  weaning weight, a l though d i f f e rences  between groups were no t  s t a t i s t i c a l l y  s i g n i f i c a n t .  (Key Words: Beef C a t t l e ,  Comnercial, Expected Progeny Di f fe rence,  Maternal . )  Widespread use o f  a r t i f i c i a l  inseminat ion  makes i t  p o s s i b l e  t o  compare performance o f  s i r e s  and t h e i r  r e l a t i v e s  across herds w i t h i n  t he  same breed. For some beef breeds, r e l a t i v e  gene t i c  values expressed as expected progeny d i f f e r e n c e s  (EPDs) a r e  a v a i l a b l e  f o r  e s s e n t i a l l y  every r e g i s t e r e d  animal i n  t he  breed w i t h  appropr ia te ,  recorded performance data. Thus, both  seedstock and comnercial breeders a r e  l i k e l y  t o  encounter EPD s p e c i f i c a t i o n s  on b u l l s  a v a i l a b l e  f o r  sa le  o r  on b u l l s  whose semen i s  a v a i l a b l e  f o r  sa le .  The ex ten t  t o  which breeders u t i l i z e  EPD in fo rma t i on  t o  a s s i s t  i n  s e l e c t i o n  w i l l  depend on t h e i r  l e v e l  o f  conf idence i n  t he  e f f ec t i veness  o f  u t i l i z i n g  such in format ion .  Research a t  t h e  U n i v e r s i t y  o f  Georgia (Hough e t  a l . ,  1985) i n d i c a t e d  t h a t  s e l e c t i o n  f o r  increased y e a r l i n g  weight i n  Hereford c a t t l e  based on EPDs was e f f e c t i v e .  I n fo rma t i on  concerning the  r e l a t i o n s h i p  o f  s i r e  EPDs t o  ac tua l  performance o f  descendants i n  comnercial herds i s  Lacking. Semen from s i r e s  a v a i l a b l e  through comnercial semen companies has been used a t  the  SDSU Antelope Range L ives tock  S t a t i o n  f o r  a number o f  years, and daughters o f  many o f  these s i r e s  have been re ta ined  as replacement h e i f e r s .  The o b j e c t i v e  o f  t h i s  ana l ys i s  was t o  examine t h e  r e l a t i o n s h i p  o f  s i r e  EPDs f o r  m i l k  and materna l  weaning weight, as pub l ished i n  1988 n a t i o n a l  genet ic  eva lua t i on  programs, t o  ac tua l  performance o f  s i r e s '  daughters and daughters1 o f f s p r i n g .  Ma te r i a l s  and Methods The data used i n  t h i s  ana l ys i s  were c o l l e c t e d  on 2 - y e a r - o l d  beef females and t h e i r  ca lves  managed i n  a d r y l o t  environment. Dam breed types inc luded crossbred Angus-Hereford and Tarenta ise-Hereford  produced i n  two-breed r o t a t i o n a l  crossbreeding systems, and a l s o  s t r a i g h t b r e d  Hereford. S i res  o f  t he  dams were Angus, Tarenta ise  o r  P o l l e d  Hereford.  Some o f  the  s i r e s  were used i n  n a t u r a l  matings, w h i l e  o the rs  were used i n  a r t i f i c i a l  inseminat ion.  Many o f  the  a r t i f i c i a l  inseminat ion  s i r e s  have cu r ren t  EPD in fo rma t i on  a v a i l a b l e  through t h e i r  r espec t i ve  breed assoc ia t ions .  Several o f  t he  s i r e s  have EPDs computed i n  cu r ren t  sumnaries even though EPDs were no t  a v a i l a b l e  a t  t he  t ime semen o f  t he  s i r e s  was obtained. Current (1988) EPDs were obta ined f o r  as many o f  t he  s i r e s  as poss ib le ,  e i t h e r  from the breed assoc ia t i on ' s  pub l ished 1988 s i r e  sumnary o r  d i r e c t l y  f rom the  breed assoc ia t ion .  Data used t o  analyze ac tua l  o f f s p r i n g  performance had no t  been repor ted t o  breed assoc ia t i ons  and so represent an independent se t  o f  da ta  compared t o  data  used t o  compute EPDs. Daughters were born  a t  t he  Antelope Range L ives tock  S t a t i o n  i n  northwestern South Dakota b u t  produced t h e i r  f i r s t  c a l f  i n  a d r y l o t  a t  Brookings as p a r t  o f  another experiment. These females entered the  d r y l o t  a t  an average 1 Ass is tant  Professor.  'Graduate Research Ass is tant .  age of 1.6 years and remained the re  f o r  1 year through weaning o f  t h e i r  f i r s t  c a l f .  A d i f f e r e n t  s e t  o f  f i r s t - c a l f  females was evaluated each year from 1981 through 1987. M i l k  product ion was measured by weighing the  c a l f  before  and a f t e r  nurs ing a f t e r  an overn ight  separat ion o f  c a l f  and dam. M i l k  product ion was measured a t  f ou r  d i f f e r e n t  dates i n  t h e  f i r s t  5 years, f i v e  dates i n  1986 and s i x  dates i n  1987. The m i l k  product ion measurements f o r  a cow were t o t a l e d  and d i v i d e d  by the  number o f  measurements. Ueaning weights o f  d r y l o t  ca lves were obta ined i n  October. Var iab les  o f  i n t e r e s t  i n  t h i s  ana lys i s  a re  daughters1 m i l k  product ion and weaning weights o f  daughters1 o f f sp r i ng .  Since comparisons o f  EPDs are  v a l i d  on l y  w i t h i n  a breed, separate analyses were completed f o r  each s i r e  breed o f  daughters. Angus and Tarentaise s i r e s  were mated o n l y  t o  cows w i t h i n  t h e i r  respect ive  ro ta t i on ,  whereas Po l l ed  Hereford s i r e s  were used i n  each r o t a t i o n  and on s t r a i g h t b r e d  cows. Contemporary groups were formed based on year o f  daughter p roduc t i on  and sex o f  daughters1 ca lves and, i n  t h e  case o f  Hereford s i res ,  a l s o  on dam breed type. Data f o r  contemporary groups t h a t  inc luded daughters of on l y  one s i r e  were deleted. Means were computed by s i r e  f o r  daughters1 m i l k  p roduc t i on  and f o r  weaning weight o f  daughters1 o f f s p r i n g  ( i - e . ,  g rand -o f f sp r i ng  o f  s i r e ) .  R e l a t i v e  values o f  s i r e  EPDs were examined w i t h i n  each s i r e  breed, and s i r e s  were assigned t o  a h igh EPD group, low EPD group or  non-EPD group. The non-EPD group inc luded p r i m a r i l y  cleanup b u l l s .  Averages were computed f o r  each s i r e  EPD group by weight ing each s i r e  mean by the number o f  records associated w i t h  each s i r e  mean. EPD s i r e s  were assigned t o  groups i n  a manner which maximized the  d i f f e r e n c e  between weighted average EPD1s o f  h igh EPD vs low EPD groups. Results and Discussion --Grouping o f  data  i n t o  h igh  EPD, Lou EPD and non-EPD groups w i t h i n  each s i r e  breed r e s u l t e d  i n  ra the r  uneven numbers o f  daughters per  group. This was not unexpected s ince matings were no t  planned w i t h  the  present ana lys i s  i n  mind. For t h i s  same reason, d i f f e rences  between h igh EPD and low EPD groups f o r  s i r e  EPDs were smal ler  than des i red  i n  some cases, p a r t i c u l a r l y  f o r  m i l k  EPD groups fo r  Angus and Tarentaise s i r e s .  Grouping o f  s i r e s  i n t o  h igh and low EPD categor ies  does no t  necessar i ly  r e f l e c t  how these s i r e s  rank w i t h i n  t h e i r  respect ive  breeds but how they rank r e l a t i v e  t o  o ther  s i r e s  i n  t h i s  ana lys is  (on a w i t h i n  breed bas is) .  Performance o f  f i r s t - c a l f  daughters and t h e i r  o f f s p r i n g  grouped by s i r e  m i l k  EPD's i s  presented i n  Table 1 .  A d i f f e r e n c e  i n  s i r e  m i l k  EPDs should be i n te rp re ted  as t h e  expected d i f f e r e n c e  i n  weaning weights o f  o f f s p r i n g  of s i r e s '  daughters due t o  d i f f e rences  i n  daughters1 m i l k  product ion. Ueaning weights were ad jus ted f o r  age o f  c a l f  but no t  f o r  age o f  dam, s ince  e l l  dams were the same age (2 -yea r -o ld ) .  For a l l  t h ree  s i r e  breeds, daughters o f  h igh  m i l k  EPD s i r e s  ranked h igher  f o r  c a l f  weaning weight and m i l k  product ion than daughters o f  low m i l k  EPD s i res ,  al though d i f f e r e n c e s  between groups were not  s t a t i s t i c a l l y  s i g n i f i c a n t .  D i f f e rences  between weaning weights o f  o f f s p r i n g  o f  daughters of h igh vs low m i l k  EPD s i r e s  exceeded s i r e  m i l k  EPD d i f f e rences .  Daughters o f  h igh m i l k  EPD s i r e s  ranked h igher  f o r  c a l f  weaning weights than daughters o f  non-EPD s i r e s .  Daughters o f  low m i l k  EPD s i r e s  produced heav ier  c a l f  weaning weights than daughters o f  non-EPD s i r e s  f o r  Tarenta ise and s i m i l a r  c a l f  weaning weights compared t o  daughters o f  non-EPD s i r e s  f o r  Po l l ed  Hereford and Angus. TABLE 1. FIRST-CALF PERFORMANCE OF DAUGHTERS GROUPED BY SIRE MILK EPDs Daughter 1st calf Daughter No. No. Sire milk E P D ~  weaning milk sires dau~hters EPD Acc . wt. lb yieldb Polled Hereford Sires High EPD sire 1 8 +32.7 .88 442.6 6.41 Low EPD sires 2 3 5 +19.4 .60 422.8 6.24 Non-EPD sires 7 3 7 421.0 6.51 Angus Sires High EPD sire 1 2 1 - 2.4 .88 454.8 8.24 Low EPD sire 1 4 - 4.7 -58 450.9 7.59 Non-EPD sires 3 2 1 445.8 7.19 Tarentaise Sires High EPD sires 1 5 + 2.9 .97 470.4 10.67 Low EPD sires 3 16 - 1.9 .89 447.8 9.07 Non-EPD sire 1 2 6 421.5 8.53 a Group average EPD and Accuracy values were computed by weighting inckvidual sire values by numbers of daughters. Milk production expressed as pounds of milk after an overnight separation of calf and dam. F i r s t - c a l f  performance o f  daughters grouped by  s i r e  maternal  ueaning ue igh t  EPDs i s  presented i n  Table 2. A d i f f e r e n c e  betueen t u o  s i r e s '  maternal  ueaning ue igh t  EPDs should be i n t e r p r e t e d  as t he  expected d i f f e r e n c e  i n  ueaning ue igh ts  o f  o f f s p r i n g  o f  s i r e s '  daughters due t o  d i f f e rences  i n  m i l k  p roduc t i on  and genet ic  growth p o t e n t i a l .  For P o l l e d  Here ford  s i r e s ,  t he  d i f f e r e n c e  betueen ac tua l  ueaning ue igh ts  o f  o f f s p r i n g  o f  daughters o f  h i gh  vs Lou maternal  ueaning ue igh t  EPD s i r e s  c l o s e l y  r e f l e c t e d  the  d i f f e r e n c e  betueen s i r e  EPDs o f  the  t uo  groups. For Tarenta ise  s i r e s  and Angus s i res ,  d i f f e r e n c e s  i n  daughter f i r s t - c a l f  ueaning ue igh ts  r e f l e c t e d  d i f f e rences  i n  s i r e  EPDs l ess  c l o s e l y  than f o r  Here ford  s i r es ,  bu t  ac tua l  d i f f e r e n c e s  i n  performance uere  i n  t he  same d i r e c t i o n  as s i r e  EPD d i f f e rences .  D i f fe rences i n  ac tua l  performance betueen h i g h  EPD vs Lou EPD group averages uere  no t  s t a t i s t i c a l l y  s i g n i f i c a n t  u i t h  t he  l i m i t e d  numbers o f  records.  For a l l  t h r e e  s i r e  breeds, daughters o f  h i g h  EPD s i r e s  ranked h igher  f o r  f i r s t - c a l f  ueaning ue igh ts  than daughters o f  non-EPD s i res .  Daughter f i r s t - c a l f  ueaning ue igh ts  uere s i m i l a r  f o r  Lou EPD vs non-EPD s i r e  groups. TABLE 2 .  FIRST-CALF PERFORMANCE OF DAUGHTERS GROUPED BY S I R E  MATERNAL WEANING WEIGHT EPDs Daughter maternal  1st c a l f  Daughter a No. No. weaning w t  weaning m i l %  s i r e s  daughters  EPD w t ,  l b  y i e l d  Pol led  Hereford S i r e s  High EPD s i r e  1 8 +36.7 442.6 6 .41  Low EPD s i r e s  2 3 5 +17.7 422.8 6.24 Non-EPD s i r e s  7 3 7 421.0 6 .51  Angus S i r e s  High EPD s i r e  1 2 1 +14.6 454.8 8 . 2 4  Low EPD s i r e  1 4 + 5 .0  450.9 7.59 Non-EPD s i r e s  3 2 1 445.8 7.19 Tarenta ise  S i r e s  High EPD s i r e s  Low EPD s i r e s  Non-EPD s i r e  a Group average EPD and Accuracy va lues  were computed by weighting in%vidual  s i r e  va lues  by numbers of daughters .  Milk product ion expressed a s  pounds of milk a f t e r  an overn ight  s epa ra t ion  of c a l f  and dam. I n  conclusion, maternal performance o f  s i r e s t  daughters f o r  f i r s t - c a l f  p roduct ion were cons i s ten t  w i t h  s i r e s 1  rankings f o r  m i l k  EPDs and maternal weaning weight EPDs, although d i f f e rences  between h igh  EPD vs low EPD groups were no t  s t a t i s t i c a l l y  s i g n i f i c a n t .  Magnitudes o f  d i f f e rences  i n  ac tua l  performance between h igh EPD and low EPD groups were reasonably r e f l e c t i v e  o f  EPD d i f fe rences,  e s p e c i a l l y  cons ider ing the  l i m i t e d  numbers o f  s i r e s  and daughters evaluated. Data w i l l  cont inue t o  be c o l l e c t e d  and re-sumnarized a t  a  f u t u r e  date.  L i t e r a t u r e  Cited Hough, J. D., L. L. Benyshek and J. U. Mabry. 1985. D i r e c t  and co r re la ted  response t o  y e a r l i n g  weight s e l e c t i o n  i n  Hereford c a t t l e  us ing n a t i o n a l l y  evaluated s i res .  J. Anim. Sci .  61:1335. 

Relationship of Sire Expected Progeny Differences to Maternal Performance of First-Calf Daughters in a Commercial Herd

https://openprairie.sdstate.edu/cgi/viewcontent.cgi?article=1020&amp;context=sd_beefreport_1988

Relationship of Sire Expected Progeny Differences to Maternal Performance of First-Calf Daughters in a Commercial Herd

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