RootsChat.Com

If MS appears only for females, it means Maiden Surname, that is, the mother's maiden name.
- in 1855 the death Registration form had a column for Parents Name, Rank, Profession or Occupation. The mother's married name was given on one line. On the next line was Maiden Name followed by the mother's original surname.
- after 1860  the parents column was headed Name, Rank Profession or Occupation of Father and Name and Maiden Surname of Mother. The registar entered the mother's married name on one line and then MS Surname on the next.

e.g. the entry for a child of John Smith and Mary Brown would be in the form:
- John Smith,
 Occupation
- Mary Smith,
 MS Brown
 

I think I've found his parents John and Helen but for the life of me I can't seem to trace back any further.

Have you been to http://www.scotlandspeople.gov.uk/ ?  What do the registration entries for his birth and his parents' marriage say? Have you found him in the 1881, 1891 and/or 1901 Censuses?
 
Have you looked for name variations (such as Ellen or Nell for Helen, etc)? 

All of the children to this couple (James Lafferty and Ann Hill) on the IGI are submitted records.

When I look at the IGI for children of James Lafferty and Ann Hill, I see one LDS submission (James, born in Antrim about 1859), one Old Parish Register transcription (George, b. 1852, Greenock) and four General Registry Office Scotland transcriptions (Samuel, 1857; James, 1858; Alexander, 1863 and Deborah, 1865). LDS submitted names are in lower case while transcribed OPR/GROS names are in UPPER CASE.

The LDS IGI database at familysearch.org is limited in the number of records that are accessible in each batch (e.g., 5000 OPR birth records, 3192 OPR marriage records, etc). The workaround has the excess records shown as "submissions" not "transciptions". The batch number shown is for the original batch the record was uploaded with but they don't get a final batch # to show what OPR/GROS Volume they were transcribed from. Also, the LDS doesn't seem to have transcribed GROS death records to for the IGI, so they get handled differently than birth or marriage records.

E.g., In the case of James, the batch # F868732 means it was the 32nd batch entered on the 87th day of 1986. The birth date of about 1858 and marriage date of about 1883 means it is probably a transcription of a GROS death record.
- Also in batch 868732 is the 26sep1871 death of John Fielding.
- In batch 8111931 is the 26jul1855 death of Fielding's first wife, Catherine Mc Gregor (my gg-grand-aunt).
- Her birth in 1895 at Balquidder shows up in the IGI as a transcribed record in batch C113314.
- The births of her five brothers in Killin do not show as being in batch C113612; they're shown as submissions in batches 7417620, 7417621, 7417622 and 7417623. But if you go to a LDS Family History Centre and look at the LDS OPR microfiche, her brothers are all recorded correctly in batch C113612. With a 5000 record cut-off,  thousands of Killin births before 1855 aren't listed at familysearch.org as being C113612.

In short, names in CAPITAL LETTERS mean the record was transcribed and Lower Case Letters mean it was submitted by an LDS member, regardless of what the website says. If the IGI name shows up in CAPS, you can probably find the record at ScotlandsPeople.   

Looking at the LDS transcription of the 1881 UK Census, there is a couple of families living at  "Troon and Loans Road Darley" in Enumeration District # 3, Dundonald parish #590-1. The only other address on Troon and Loans Road in ED 3 is "Troon and Loans Road Auld Bennels" (six households).  Immediately after the Darley homes are households at "Ayr Road Muirhead". Most of the addresses in ED 3 are listed as "Ayr Road Loans", with several having named buildings.

Looking at Multimap.com's Ordnance Survey, Darley Burn, Murhead and Loans are east of Troon.

I'm guessing Darleyhall would be near Darley Burn. The modern Ordnance Survey map doesn't show it, but older OS maps might. It's possible that Auld Bennels is another name for Darleyhall.